It works perfectly with a stainless steel mug.

Works well with standard (slightly concave bottomed) mugs

I actually looked online for the best mug warmer,, this was #1, so I bought it

Keeps my mug of coffee warm enough to empty my mug and enjoy the last drop

Keeps my mug of coffee warm enough to empty my mug and enjoy the last drop

Keeps warm a nice size mug of coffee while surfing.

The only thing my husband didn't like was his huge mugs don't fit on the warmer (but we knew that going in on the size) and that the switch wasn't on the cord and on the plate (which we also knew going

My thick ceramic mugs from Pier One usually work pretty well

This is a nice mug warmer, but its more of a mug furnace

Normal 12 oz should work though, my mug on picture is 18oz

The instructions recommend using a stainless steel mug

I bought a cheap silicone disk lid to top the mug to keep the heat in

This mug warmer is exactly like my other warmer that has lasted for 10 yrs.

I used my Yeti mug and the stainless steel mug got so hot I couldn’t pick it up!

Read the reviews and was afraid a large mug wouldn't be kept warm.

This warmer keeps my mug of tea or coffee at just the right temperature

I love this mug warmer

I love this mug warmer

This is a great mug warmer

Warning on using a stainless steel mug.

It keeps my ceramic coffee mugs VERY warm, even after long periods of time

A regular mug won't work

I tried it with my Contigo travel mug since that is the only stainless steel mug I have, but the mug keeps my tea hot so well by itself that I couldn’t tell if the mug warmer was doing much

Some mugs work better than others (I have an oversized tea cup that doesn't work that well, probably because the base of the mug is small (where the heat is distributed from the warmer) but the surface area of the coffee is large and heat escapes through the surface area).

I'd say I got a decent mug

I use large mugs and am satisfied with the results

Keeps my coffee hot all day long as long as u put a lid on it.