No problems so far
I try not to write reviews unless I've tested gear at least 3-6 months with consistent abuse and I'm at the 5 month mark with no problems. I can't comment on durability yet, as I need to test it for at least another 6 months before I'm completely sold. Over the last 10 years or so I've had several brands, especially Camelbak, and all of my previous bladders have failed me in too short a time period. I'm not a fan of the design in which you screw the cap down as I always seem to have leaks. The Platypus design intrigued me so I made the switch and I'm glad I did. I've taken my 3L on dayhikes, overnights, trail runs, road runs, and I'm planning on using it for a Ragnar relay I'm doing next month in Southern California. However, I've not used it in temps below 20 degrees and I don't ski or snowboard, so I can't say if it's useful for those particular pursuits, though other reviewers have commented upon using it for snow sports. It fits my Marmot Ultra Kompressor, Osprey Stratos 36, Osprey Aether 85, and Mountain Hardwear Truckee 35 with no problems. The hose is easily detachable from the bladder, which makes the bladder easy to refill. Overall, it seems every bladder brand has its own drawbacks, but I definitely recommend the Platypus for all active pursuits. Oh, and it has no plastic taste!