I've been using this for a few weeks and am mostly happy with it. It keeps drinks hot or cold for my entire workday, and I really like that it comes with two styles of lids. The straw lid is great, and works as you'd expect. The flip lid is good, it has a nice carrying handle and seals tight, but I find it hard to drink out of. I usually end up just using it to keep my coffee warm and then pour into another cup throughout the day. I do wish this was dishwasher safe, because it is tall and narrow it can be hard to hand clean without a bottle brush. Luckily, I only use this for black coffee and ice water, so the cleanup process is fairly easy. Even though it is tall, it has good balance and fits in standard cupholders.