Lisa Gould wrote a review of MSR HyperFlow Microfilter on March 27, 2011
My husband and I bought this filter on the reccomendation of a fellow hiker and we love it! We haven't had any issues at all with it. It's very compact, light and simple to use. We used it all last summer with no problems. We are only using it for two people so maybe a larger group wouldn't have as much luck but for two, it's awesome.