Product review (4 stars): Pretty good
I can get clothes slightly cleaner by washing them by hand, but this works just fine and is easier on my back.  Pretreating spots and stains seems to be required.  But it is fast, and works as well as a regular washer.  Certainly easier than lugging everything to the laundromat.

You can fit more than some people realize.  I had two full sized towels and a pair of shoes in there once.  Or a full sheet set, including pillowcases.  2 pairs of jeans and 6-8 shirts.  Really, it's not that tiny.

I have a spin dryer as well, and together, they work great.  One load in the wonderwash ends up being about 3 in the spin dryer, but they're both so fast that your laundry is done in about 15 minutes.

It does drip some, I just put a towel under it.