There was another post on this. My thoughts:
It holds 20 gallons, but purifies 2 gallons- so what do you do with the other 18 gallons?
It's made for developing world, but the design sort of assumes a smooth road.
Filters are an inordinately expensive way to purify water- find for camping, but not so hot elsewhere.
__________________
"be careful this rando stuff is addictive and dan's the 'pusher'."