Product review (5 stars): Meets its claims
My wife bought the Wonder Wash and took it camping in the Colorado mountains.  It lived up to its claim.  Our family consists of a husband, wife, and two sons.  Each evening we did laundry duty.  It took 30 - 45 minutes to wash 3 - 4 loads and line dry them.  Not bad considering the local laundromat costs us $5 per load!

The only draw-back is that the stand is less sturdy than I'd like.  (The youtube video mentions this too.)  Luckily I'm a handy person.  It wouldn't be too difficult to build a new stand if (or when) this one breaks.

The actual cylinder works quite well.  Very good alternative if you find yourself without power and in need of a set of clean clothes.