Michael Rwrote a review of MSR MiniWorks Ex Water Filter on November 27, 2015
Familiarity: I've used it several times
I took this on a trip down to Chiapas, Mexico with me and while down there some local people took me spear fishing down on this river. As fun as that adventure was the purifier was much cooler to the people than their fish. They had never seen or even tasted clean water without having to buy it in a bottle. The moment my bottle was empty I pulled the MSR MiniWorks EX Water Filter out of my pack and proceeded to fill my bottle from the river. The people were pretty protective trying to say its not good water. When I finished the took a drink, lets just say I spent the next 20 minutes filtering water for the guys to drink :)
Also, been a while since I've been back and not sick. Id say it did its job.