Nice !!!

No me gustó la calidad del teflón que traé, es de muy baja calidad, sólo he puesto mi taza sobre la cubierta de teflón y ya se está desprendiendo parte del teflón.

Great mug warmer and holds temperature. Make sure the mug you use has a flat surface.

I purchased both the Cosori Coffee Mug Warmer and the matching stainless steel mugs set (Cosori C1601-CM, recommended by the manufacture for this product) from Amazon recently to solve a challenge. I like to enjoy my coffee slowly which means my coffee often becomes cold before I finish it, and I don't like cold coffee.Although a few reviews had already pointed out that the Cosori Mug Warmer does not perform as well as other mug warmers, I decided to give it a shot anyway as it had many features that were not found in other products, like matching mugs (sold separately), a digital read out, and a DC power source.The mug warmer arrived in wonderful packaging and was a breeze to set up and plug in. The digital read out is very bright and can be easily read from any angle. I like that it uses a switching power supply with a DC voltage of 12V to drive the warmer, this means that mains voltage (120V AC in the US) is not present at the warmer itself which eliminates the chance of electric shock.Another important safety feature on this unit is it will not power on automatically when plugged in or from loss of power. For those (like me) that do not unplug their appliances after you have finished using them, this safety feature will keep the warmer from turning on suddenly after being plugged in, or when power is restored in the event of an outage.Not onto the important question.. Does it work?After a few cups of coffee and some rather scientific tests, I can confirm that it does indeed perform exactly as the manufacture describes (slightly better in my testing). The mug warmer does keep a beverage warm to a maximum of 131F as stated by the manufacturer in the description.Despite it working as described, through this journey I have discovered that 131F is just not hot enough for my liking, but everyone's preference varies. If you like a steaming hot cup of coffee and want that temperature to last, this might not be the warmer for you. If you're happy with a beverage warmed to up to 131F, you're going to be very happy with this product.I give this product 4/5 stars. I would absolutely give the product 5 starts if certain improvements were made to the warmer and possibly the stainless mug to improve the thermal conductivity and insulation from heat loss to parts of the mug not directly in contact with the warmer. The digital temperature readout is useless when it's reading up to 37 degrees warmer than the actual temperature inside of the mug.This is such an awesome product, but for the price I paid (over $55 for the combined purchase of the warmer+mugs) I expect it to be more efficient and be able to warm the contents of the mug higher than 131F.--------Geeky stuff ahead! If you're not interested in the techie details, you can stop reading now.Using a DS18B20 temperature probe and an Arduino Nano to do some data logging. I tossed together a Node-Red flow to pull temperature measurements every second and then graphed those values in a spreadsheet. (See the attached graph)I conducted the following test -1. Heat water in an electric kettle to 190F2. Pour 12oz of hot water (350 grams) into a Cosori stainless steel mug3. Place the mug on top of the mug warmer4. Turn on the mug warmer and adjust to 190FThe temperature logging was started and the mug warmer was then turned on. The starting temperature measured by the probe was 167F (75C). Over the course of an hour, the temperature continued to drop, not rise; eventually leveling off to about 136F (58C). Confusingly, the mug warmer's digital screen was reporting this temperature as 173F and never went higher. Using an infrared thermometer I was able to confirm that that this is an accurate temperature for the warming plate.You're probably wondering, how can the warming plate can be 37 degrees warmer than the temperature of the water in the mug? The main factor causing that gap in temperature is the imperfect thermal conductivity between the bottom surface of the stainless mug and the surface of the heating pad. Although no two objects in contact with each other will ever be 100% efficient, I believe there's still room for improvement in the design to allow more heat to be conducted to the mug. Additionally, much of the mug is not insulated, allowing heat to radiate away.Improvements I would make to the design -1. Increase the surface contact on the bottom of the mug. The total surface area is 7 square inches, however the large dimple in the bottom reduces that surface to just 4.6 square inches!2. Double wall insulate the sides of the stainless mug, or add more insulation to the outside of the mug to reduce radiant heat loss.3. Make a drinkable lid that can cover most of the cup leaving a mouth-hole to drink out of to further reduce heat loss.Note: Although the mugs are supplied with covers, the instructions say the covers are not intended to be left on the mugs while consuming your beverage. The mug lids could provide some insulation and reduce evaporation cooling, however since the instructions say to not drink contents with them on, therefor I did not conduct testing with these lids in place.

I sip my coffee slowly taking an hour to drink a cup, this device keeps my coffee nice and warm/hot. The temp can be adjusted to precisely my desire, which is 190F for me.

Estoy muy contento porque este dispositivo realmente mantiene muy caliente la taza de mi café; pero es importante comprar también las tazas metálicas de superficie plana de esta misma marca. Por que las tasas de cerámica no son buenas conductoras de calor. Ademas el producto es de excelente calidad.

Product works well, however you pretty much need to buy the COSORI mug that goes with it to get the full benefits of the item. Thermal / doubled-walled mugs do not work well at all and neither do ceramic ones. I've also found that in order to keep your drink at a high temperature, you need a lid. Also, the more of your drink you consume, the harder it is to keep the remaining liquid warm.

Yes, you are going to pay a bit more. For me, so far, it is worth the extra cost. I have only had the unit for about 10 days, so will have to see what kind of longevity it has. There is almost nothing to not like about this unit. It has a nice heft to it with a brushed chrome metal case. Cannot tell if the bottom is metal (black) but it looks like it. The bottom is well ventilated with holes and sits off the surface to allow air flow. Others I've had were plastic except for the heater. Others have eventually burned out. The last one I had burned out after I accidentally placed a package of buns on it while it was still on. The plastic on the buns and most of the heater case melted severely so I felt pretty lucky I didn't start a fire. With a metal case that should be less of a problem. I LOVE the controls. The digital temp display and the temp up/down arrow controls are cool but not particularly useful. It doesn't take very long to hit it's max temp of 230 F; you can watch it happen. The touch controls (not buttons or something you press) are nicely modern. The on/off button is right there in front. Other units I've owned, had a slider on/off, on the back that took some effort to slide. So far, I could not be more pleased and would highly recommend. Two very minor complaints: I wish the heating plate was slightly recessed. I am used to using my cup, on the plate, closer to me. Now the cup just slides off if I pull it. My biggest complaint is that the on/off symbol is white when the unit is on and RED when off. Red does not mean off to me. My glass stove has an indicator on the control panel that is lit RED when an element is still hot; i.e., red means danger. My preference would be that the control panel not be lit at all when the unit is off. I would like there to be an over temp shut off, and maybe there is, but I just don't know.UPDATE: I went back and read other reviews. Two things others have mentioned are worth of note. First, the whole case around the hotplate does get very hot.(not the controls which seem to be embedded in glass). Since I never have had a reason to touch these areas, I had not noticed. As mentioned, this probably means that the stuff inside the unit is also getting very hot. Whether this will impact longevity remains to be seen. Secondly, I decided to check the temperature of the table surface under the unit after it has been operating for a while. As I said initially, the bottom of the unit is very well ventalated with holes and the unit sits about 3/16ths of an inch above the table on rubber feet. It turns out that the table surface under the unit does get quite warm. Not so you could not leave your hand on it but just hot enough to make you wonder what kind of damage could be done over time. So far there is no evident change in my wood table's surface, but I am considering finding some higher legs to minimize this support surface heating. I have to note that I never checked for or noticed this support surface heating with the other units I have owned.I do want to again emphasize how effective this unit is in keeping my coffee warm. I always have used ceramic cups (not mugs). They have a raised outer ring on the bottom that keeps most of the bottom surface off the heater; only the raised ring is in contact. This unit keeps that last half cup of coffee very warm (not hot) and still pleasant to drink. The two other units I have owned did not perform as well. You may need to experiment with different cups to find ones that perform well with this kind of heater.