Excellent! I purchased the 64 ounce version. Success at getting in 64 ounces of liquid is high if you fill this at night and drink as you carry it with you throughout the next day. It comes with cleaning tools (wonderful!), and it's easy to clean. I wish this bottle could fit in my car cupholder, but then it would topple over easily when placed on a flat table and filled with liquid. The bottle feels a little large, but the handle makes it easy to carry. Because I need a drinking bottle that does not require me to refill it at all during the day, I will deal with it feeling slightly large. The most important thing is that I get in 64 ounces of water per day, and this bottle makes that easy. For those concerned about not being able to drink the last ounce or so due to the way the straw bends at the bottom, one solution is to fill the bottle over the 64 ounce mark to START . . . at about 65-66 ounces. I'm very glad I made this purchase.