Product review (4 stars): Works as advertised
I can't speak for the build quality as I only used it twice now.
It shipped with a severe plastic/epoxy odor which was easily remedied by a bit of water and laundry soap.  It feels cheap, but provided the seals hold I don't get the impression it'll break.  That said, the resulting light weight is appreciated.
It lacks the lower drainage tube of the (original?) WonderWash, but that's a terribly slow way to drain gallons of water with wet clothes clogging the way and I prefer to just dump the water.

It turns pretty easily.  The rubber stops at the bottom do a well enough job of holding it in place but you'll still want one hand on the base, one on the crank when washing.  This is best used in a spot where it's ok to get a bit wet, if not a bathtub then at least a sink area.

Most importantly, it DOES clean quite well. Filled half with water and a pretty small amount of liquid detergent it cleaned 3 shirts, 2 kind of nasty rags and my boxers as well as I'd come to expect my washing machine to.  I go a bit longer than they recommend, maybe 3 minutes or so turning, and a minute on a rinse.

I just fit a queen sized sheet in it without a problem, but I would call that about the limit, including water and space to move during cleaning.

This, paired with a wringer or spin dryer is certainly an effective alternative to a full sized washer or trip to the laundromat for most needs.  What it lacks in size it makes up for in speed, and I'll be using it instead of my machine machine most of the time for that reason alone.

Edit:  2 months of regular use and it's doing fine.  I've been doing whites or smaller loads in it while the normal washer does the bulk of my clothing, about twice week or so and it's been great.  My whites never amount to a full sized load and sometimes I have time and I prefer to just get the laundry done in a few minutes before it adds up to a "washer" sized load.  I'm starting to think I'd have appreciated a draining hole at the bottom like the real Wonderwash so I could leave it in the bath tub to drain and get back to it, but overall it's a great addition/alternative for my laundry.