All I can say is that I have not yet used a better water filtration system - and I have used many of the commercially available ones out there. You really have to use this to witness its simplicity and functionality. It is as simple as filling the dirty bag, screwing the ~3oz filter on, and letting either gravity do the work or lightly squeezing the bag to quicken the process. The only potential downside I've come across thus far is that the filter needs be kept from freezing (as most do), and also that the supplied bags are arguably weak. I personally have not had any issues thus far, but I do bring a 1L platypus that doubles as a backup. All in all, I believe that this is one of the best filters currently available on the market.
Sawyer Squeeze Filter rated 4.0 out of 5 stars from 1 reviews.