I had the same reaction to the Squeeze: neat idea, no leaks or issues with the reservoir, but not furiously practical. Not only is it hard to fill from a puddle, it's also hard to fill from many of the creeks I encounter: shale or sandstone bottoms (sheets, not gravel) with an inch or two of water flowing over them - no way to dig a hole to let the bladder fill.

Have a buddy who had lots of problems with the intitial version of the Hyperflow (works in a gear store, was an early adopter.) I waited a year or so to get mine, and they do seem to have the bugs worked out (or at least I've never had any of the problems he described.)