Contigo 16 Oz Matte Black Water Bottle

I saw the TV ads for these and decided to try one (also, it was on sale ;-). It appears to be as leakproof as advertised. I don't commute by subway, and I don't carry my travel mug around as I work, so I can't comment on durability in those situations. I mostly use it in the car, where it functions pretty well and hasn't leaked a drop. Today I left it in the car while I took my dog to the vet. After an hour in a 20 degree car, my coffee was still a little above lukewarm. That's not as good as my trusty old Aladdin thermos, but it's not unreasonable. If you look at this mug, it doesn't have thick double walls like a thermos or thermal carafe, so I think it does about as well as you might expect.As for appearance and construction, it feels and looks great. The top is made of fairly hard plastic and looks like it would crack if hit. In general, the leakproof top seems much more complex than a common cheap travel mug ... it works well, but does more parts equate to less durability? For my automotive use, I'm sure it'll be fine. In a more active environment I'd probably look for something less expensive or more seemingly built to withstand impact or mishap.And that's really the bottom line, I think ... given the great look and feel, good performance, and expectation of questionable durability, how much would I be willing pay for one of these? I bought mine on a super-duper Lightning Special Ultra Discount, or something like that. So I paid about half of Contigo's suggested retail price ... and to be honest, that's about what I think it's worth. Be patient and wait for these to go on sale.