I have a Katadyn Pocket and love it (It has a 20 year warranty). On a hunting trip two of my friends brought their MSR Miniworks and both of them had failures after the first day. I suspect it was due to the freezing temps during the night, but what ever the cause was, the final result was no water from either one of their filters. We relied on my Katadyn during the rest of the five day hunt.
It's a little hefty to pack around in a ruck, but it's a compromise I'm willing to make.
7.3 Super Duty, 4X4, Ext Cab Shortbed, 6 Spd Manual. Hawk FWC
2006 Jeep Unlimited
Lexus is250 AWD (Hers)
1980 HJ45 Diesel LBP (Sold to some dude in Utah)
1984 Troopy, ExPo White (Sold to the same dude in Utah that bought my other dream truck)
Kimberly Kamper (Sold to the Toyota Shaman)