I've never had a complaint with it, and originally bought it because after doing a lot of looking around, it was the most robust one I had found. Another thing I like is the fact that I can keep it going in the field. The MSR (at least when I got mine) was one of the few that had a cleanable (in the field) filter, and parts kits available. When I got mine (1998), I got an extra filter (ceramic) and two spare parts kits, and haven't needed to buy any replacements yet. As far as my experiences with other filters, I've had various filter bottles that I've carried for daily use of tap/fountain water, and while most any of them are fine for supposedly "safe" water, none of them would begin to stand up to my MSR.

Troy