We have used the "Guide" version of their filter on dozens of trips. The filter seems to avoid clogging better than some of the smaller units, and it fills a liter Nalgene bottle a lot faster than the MSR filters I've used. I think it only takes 30-40 strokes to fill a bottle. The quality of their products is quite good, I have friends with the "Hiker" model also who have had no problems, but, the filter element seems to be replaced more often.