FatPharm wrote a review of MSR MiniWorks Ex Water Filter on March 30, 2014
Familiarity: I've put it through the wringer
I've used it for many trips here in VA over the last 4 years and have yet to see a real failure. Sure, if you're not careful or don't prefilter, then it will slow down faster then you might expect, but its also pretty easy to fix or maintain in the field. The vast majority of the time, all you need to do is pull the filter, scrub the outer layer off, give it a little rinse, and get back to it. How do I rinse it if I need the filter to get clean water? Even heavily clogged I've been able to get enough water to clean it in a few(ish) minutes. What if I forget the little scrub pad? In an emergency I've used a t-shirt to remove the dirt (not ideal I know, but it worked). The only other work I've ever had to do required no tools, only boiling water and vaseline. Its a reasonable price given the filter market and its given me nothing but clean water, though at not quite the advertised speed.