Bests & Worsts Reviews from Amazon

This is a great idea but the cup has a ton of flaws and is a poor choice as a travel mug. First, both the plastic top and the glass itself retains odors. The glass holds onto the smell of coffee (which isn't too bad) but the top has a very distinct plastic/rubber smell that can ruin every sip you take. Since purchasing it, I've disassembled it and washed this twice a day with no luck. I've resorted to drinking with this KeepCup with the top off which makes it unusable on my drive to work. Second, and more importantly, the lid will not stay on. The manufacturer states to "Always open plug vent or remove lid when cup contains liquid over 65C (150F) ." I brew at 202 F and now let the glass sit a minute or so before capping with an open plug. Waiting isn't ideal as the glass (as expected) isn't great at holding heat : it goes from kinda hot to kinda warm in 15 minutes. I can't preheat my glass because it may keep the glass above the recommended temperature which means the lid won't stay on no matter what I do. Even with the plug open, I have to constantly push down on the lid (no easy task when you're driving a manual) to keep it from popping up and spilling coffee all over my car. Despite my best efforts, this glass has spilled coffee over my car 3 times in 6 uses. I'm extremely disappointed in the KeepCup as I'm looking for a nice glass travel cup to take to work. I think I may have to resort to a stainless steel, vacuum insulated mug that not only can keep my coffee hot, but doesn't impart a strange odor and doesn't spill all over my car. TL;DR - Pretty cool looking glass. Absorbs all odors, plastic lid smells weird, and the lid won't stay on.