Wow. I'm the cheapo of the bunch. I use the Bubba from Walmart. I use the 18ounce instead of the bigger (32 oz I think) because the big one never kept the coffee hot for very long. Honestly reporting, I say my coffee stays scalding hot for 20ish minutes, maybe 30 on the outside, and it stays hot for another hour, warm for another hour. For me that's long enough for me to sip my coffee and have it refilled from the thermos before it ever gets cool.

Oh did I mention that it don't cost very much either. Yes, I'm cheap.