I've been using this insulated travel tumbler daily for a few weeks and it does exactly what it promises. The 100% leak proof lid gives me confidence to toss it in my bag, and the lockable one-handed opening is handy when I'm driving. Hot coffee stays hot for around 6 hours, and cold drinks stay cold for about 8. The 18/8 stainless steel feels solid, it fits my car cup holder, and the lid comes apart for a proper clean. BPA-free is a nice bonus. Only note: it's a 20 fl oz size, so plan refills accordingly.