User Review: SteriPEN Classic
We used this product in Kenya for a group of 14 people for 10 days. Never heard of it until one of our guys pulled it out, so we also used chlorine.
I think for colder lake and stream sources (Lake Superior, Rockies, etc), I'd consider using this product again. But for most situations that involve warmer, cloudier waters, I'd rather use some filter that removes particulates and associated tastes and odors.
We used my MSR Waterworks to filter water from an open well that had a "sweat" taste for a team of 7 people for two weeks in Romania; the filter removed quite a bit of a solid yellow substance we couldn't identify. The Steripen wouldn't have done that.
I still love the reliability and longevity of the MSR ceramic filters(Waterworks/Miniworks). I might consider using the Steripen abroad to remove viruses after using my MSR to remove particulates and taste. But probably not alone outside of the high country.