The mug/thermos keeps my coffee hot for hours and does ...
359151
The mug/thermos keeps my coffee hot for hours and does not spill or leak even when upside down in my bag.
1613620
This thermos keeps liquid hotter for longer than any other cup I have tried.  I put hot water in it to warm it up a bit, then my coffee in the morning. Coffee if still pretty hot at 1:00pm in the afternoon.  I love it.
3265813
Well, you all already know how it looks and what it does. I am going to talk about what it doesn't do. The lid is not leakproof. I can't put this in my bag because it might leak. You really have to keep it upright. I would like the thermos to keep my coffee warm for at least one hour to 2 hours. But it worked for like 30 minutes. You cannot reheat it in the microwave either, so that's a bummer.

Sample provided without any obligations.
1123443
It's been 4 hours since I filled this with coffee, and my coffee is still almost too hot to drink. It's almost annoying how awesome this Thermos Mug really is!  I definitely recommend it for anyone who doesn't like to have to keep re-heating their coffee every 15 minutes.
2401613
I have 5 if these mugs and they keep drinks hot for at least 1-12 hours if you preheat them and keep them closed when not being used, and they keep cold for longer periods of time.  Thank you again Thermos.  I have given them to my 4 children and their spouses and to some of my 19 grandchildren and they all use them all the time winter for hot and summer for cold.  I have had mine for about 5 years and it still works like new.
2280185
It does keep coffee hot for a long time.  I don't care for the lid  -if you're not careful you could get hot coffee on you when you take a sip because of the way it is designed - coffee can come out all around the lid
100807
Coffee stays hot for hours but don't tighten the lid tight, it makes getting it off very difficult. Great mug though.
4028421
I may have just have gotten a bad one, but the one I recently purchased does not keep things hot.  I have poured freshly made steaming hot coffee into the Thermocafe multiple times and within an hour it is barely warm.  Since the job of the thermos is to keep things hot, I am considering this to be a complete product failure.
2704171
This is great MUG! It keeps my coffee/tea hot for at least 5-6 hours!!! I make my drink at home, close  the lid, drop it into the bag, and drive to work. Once there, I enjoy my HOT coffee sipping for many hours!!! Highly recommend!
523895
This mug keeps my coffee hot from 8am until I leave for lunch at 12:30-1pm. It's incredible! If you like hot coffee, you must get one of these, Thermos you are genius!
2942633
yes it keeps the coffee hot and takes at least two hours to get to point have to microwave it after it shuts itself off
3131679
This is the best coffee mug I've ever had.  Keeps my tea or coffee piping hot for hours.  Well worth the investment.
55275
As long as we preheat the mug with a little hot coffee, the contents stay hot all day. But I was really surprised how well it keeps cold contents chilled. Yesterday, I kept adding ice to my coffee for iced coffee. This morning, when I went to clean out the mug, it still had ice in it even though the cap was in the open position. Great mug!
3543601
This mug works! I walk to work 1 mile with it closed rolling around in my bag, and it DOESN'T LEAK. The only problem is that it keeps things hot for a very long time. If you leave coffee overnight, it is still lukewarm the next day!
1094161
UPDATE:
Their customer service contacted me and fulfilled their one year warranty offer and sent me a brand new cup, great customer service!

This keeps my coffee hot for hours! I can pour it into this mug at 8 in the morning and it's still too hot to drink by the time 12 rolls around. Unfortunately, the locking mechanism has stopped working which was a huge plus for me since I have 2 toddlers always going for my drinks.
4158353
We have used this thermos for cold teas and beverages in the summer and hot beverages in the winter for over three years.  The coffee remains hot after being in the thermos for 9 hours.  However, this is contingent upon having the thermos over half way full.  We recently purchased a Keurig and have noticed that less liquid that is in the thermos means the shorter amount of time the liquid will remain hot.  Otherwise, a very durable and attractive work thermos.  My husband enjoys it.
2515194
This mug is amazing. My coffee stays hot for at least 4 hours I don't know if longer than that cause I drink it before then. This is our second thermos my husband has the one with the handle. I do not like the handle as well because you have to have the lid line up just right this one it does not matter cause handle is not in the way. If it does not fit in car holder just use a beer cozy to take up extra space