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In addition to the filter bottle I carry a steri pen as well. When I'm in areas that I trust the H2O I only carry the steri pen. The steri pen kills all the protozoa and stuff, then I let the filter rinse it all clear.
I use a Katadyn and have never had a problem with it. The one I use is the green 32oz. squeeze bottle ($45). I think the one your talking about, is the clear/white little one? depending on my hike or hunt I will carry either a filter bottle or pills. I am leaning towards the pills more often. I feel they are just easier for what I do.