Have it...use it...love it.
Best part is turning it inside out after a hike and running it through the dishwasher to clean it before stowing away for another hike. Love the option to pressurize for spray...lets say you get a cut or something in your eye. Also...easy to fill the bag...dip and go. Rare but...think of a small backwoods stream where your typical pump system may not be able to work if the water isn't deep enough. Put a small rock on the lip and watch the water trickle in while you rest.
This is small but nice...when your hoofing it up the mountain...its nice just to bite down and have it spray into your mouth vs. having to suck between breaths while walking. I give it two thumbs up man...go get yourself one and put that inline filter on it!