Does anybody have any input on this Survival Water Purifier?

http://www.optactical.com/suwapu.html

http://www.uscav.com/Productinfo.aspx?productID=6349&TabID=548


I already have an MSR miniworks, which is excellent, but I'm looking at this for my Survival vest. I EDC the miniworks in my bag but its to big and heavy for the vest (which I will post pics of when its finished) The vest is in the bag (can't wear it to or in work) and always with me but the bag is discarded if it has to be. My thoughts are with the SWP the miniworks can go in the big go/camping pack that lives at home



Any input or alternatives?

Thanks

Blitz