I got this because I've been looking for a pour-style spout that doesn't require me screwing a top on and off, esp one that allows for one handed operation. This does the job marvelously, you just press and pour into your mouth!
However, sometimes, the stream seams to be just trickling, and I've tried to clean it with hot water. I've concluded that that's because air isn't going back up in the bottle because of the bottle shape (it becomes a bottleneck because the top section made space for the hidden compartment). So you just kinda have to shake it a little for the air to get back into the bottle.
I was afraid that the dust during Burning Man would get the mechanism stuck, but I used this water bottle all week and it still worked at the end of it all. The hinge of the compartment got a little creaky, but nothing a little WD40 didn't fix right away.
If you're looking for a 1-handed pour-style bottle (cuz you can't stand the type you have to suck or squeeze), this is the best I've found!!