AC Coffee Warmer

Pros: Great temperature, really holds your coffee/tee/whatever warm. Have a on/off switch.

Cons: None!

Other: I forgot to buy a flat to round power plug convertor, so if you live in Europe, remember to buy it!

Pros: It really keeps warm.

Cons: None

Other: Worth buying

Pros: Keeps drinks hot for long periods, tactile on/off switch, A/C powered means one less used USB port, price is right.

Cons: Very loose fitting plug; will slip out unless held in place, cord is abit too short and thin, build quality is average, on/off switch in awkward spot; would of liked it at the front of warmer.

Other: Although it does what it's supposed to do, the design and quality could've been better. The loose fitting plug is a nuisance as well as cord length. But for the price it's a good buy.

Pros: Cheap.
Also, it doesn't produce too much heat so I assume it will not spontaneously catch fire or explode. : )

Cons: WEAK!
Takes about half an hour to heat a bottle of cold water to just about 'cool' when room temperature is about 15°C.
If it's hot water though, it can keep it warm for an hour or two.

Other: It was worth having around when I only had cold tap water to drink. Now I get hot water from a kettle, and it sort of helps to keep it hot for longer.

Pros: VERY easy to use it! A 1OO% Idiot Proof!
Weights nothing and fits on average Desks;
Helps to Adress, Organize & Parks your Cup;

Cons: Do NOT works in average Tropical Contries!
The maximum temperature, is about the 37ºC.
If your region is COLD, I think it is OK.
The designed pieces, are NOT very strong;

Other: Spents very few volts! Buy two of them!

Pros: The pad is made of a plastic that feels a little flimsy if you press on it as it bends down, however it looks like it is built well enough for the job. I left it on for several hours, maintained heat on the pad (hot to the touch). It works very well if you use a stainless steel or copper cup. Very affordable, these usually sell here for $10-15. Better than USB as it does not take up current or power from computer.

Cons: While the pad generates enough heat to be too hot to keep your fingers on it for longer than a few seconds, it is not enough heat to make any difference in keeping warm an already hot cup of coffee if the cup is ceramic or glass (I have tried different shapes and sizes). Every time the ceramic or glass cup gets cold just as fast as without the warmer, so you need a metal cup.

Other: great deal for the price!

Pros: It's very cheap thats to only positive thing i can say. It get's warm in a way you can touch it without immidiatly remove your hand.

Cons: Mine broke down after 3 months. I don't even bother to get a new one because changes are big that it will break down as well. It was fun the time i made use of it ( 2 times a day). And definatly kept my mug warmer than without it.

Other: If you want to try go a head. But it probably will decrease in heat so that it won't even feel warm after several months of use.

Pros: Helps keep a beverage warm, doubles as a coaster :)

Cons: Electrical plug on the end is not standard thickness - leads are a little smaller. Tends to slip out of some receptacles (namely cheap power strips). Not usually an issue, I only have one power bar that it does this with - fine everywhere else.

Other: You need something to put your mug on anyway, this'll help keep it warm at least a few minutes longer, and its inexpensive. Give it a shot.

Pros: gets pretty damn hot. Damn good price

Cons: poor transfer surface

Other: without a thermal pad it doesn't keep anything warm at all. With the thermal pad it keeps my 2 L pot of tea in a ceramic pot warm at a constant 60°C. and don't worry, silicone thermal pads can withstand 200°C temperatures without melting.