Nathan H.wrote a review of MSR HyperFlow Microfilter on June 1, 2014
Familiarity: I've used it several times
I got this last year and used it once with great success. When I went out recently for a four night trip, it was extremely difficult and slow. It maybe put out about 1/4 L/min. Backflushing helped the speed slightly but I was not impressed. I had a Sweetwater for years until the handle broke, and would go back if I could.
Pros: Very fast, lightweight, compact
Cons: High maintenance, low filter life