Product review (2 stars): Better than handwashing in the sink...but not a whole lot, for me
When my washing machine died while I was getting ready to move, I decided to try this instead of getting another machine.
To begin with, I bought a washtub to go in my bathtub so I could do small loads. The tub was too large for my cast-iron tub, and rocked. If you should go the same route, be sure to measure your bathtub and get a washtub that will fit flat on the floor.
Secondly, I did not find that it was very effective at getting the clothes clean. A lot of work, filling the washtub, using the plunger (pardon me, "mobile washer"), emptying the water, refilling it and rinsing the clothes several times, squeezing them out and putting them in the dryer, for no better results than I got. It may be that I just didn't have the stamina to keep at it long enough.