Great for mixing up protein shakes quickly
Does what its supposed to do, and does it well. High quality construction, no leaks, easy to use too. Have been using it for about 6 months regularly with no signs of wear.
The only complaint I have is the hinged part of the lid: It can be difficult to clean thoroughly. Not a big deal if you rinse it out really well immediately after use.
Amazing bottle but dont screw the cap down too hard every time or the seal will break on the lid and its useless.