Product review (4 stars): It works, just don't use too much detergent/softener or you'll be rinsing forever.
I have had this, or one almost like it (gotten from Amazon), and used it for about 3 years now after our automatic washing machine stopped working.  We're both retired now so don't need business attire and we don't seem to mess up our clothes as much as we used to so there's less to wash.  It works.  I bought a couple cheap 5 gal. paint buckets at the hardware store and use them--fill them up and let the items soak overnight (or at least for 4+ hours), then use this blue thing to bash the items a bit.  I would say I bash for less then a minute (I imagine I'm churning butter just so I don't give up), then pour out the dirty water, refill with clean water, bash it a bit more, pour out that water and dump the wet items into a very big (cheap) colander/strainer I set in the bathroom sink (all washing and rinsing are done in the bathtub so I can splash all I want).  I do sheets too or one sheet at a time, and towels (1 bath, 2 smaller hand towels).  I can't do a whole lot of clothes at once, pair of jeans, couple of t-shirts, couple of underwear--I do maybe 2 washing per week of only our clothing.  It cleans well but I pre-treat any real stains and sometimes use baking soda when needed.  Then after it's drained an hour to get the drippy water out, everything goes into a small spin dryer (which makes a huge difference, we initially had problems with the clothes not drying thoroughly enough in the dryer unless you ran the dryer for 3 hours or more; the spin dryer squeezes out a lot of the water and the stuff only need maybe an hour in the dryer).  It works, although as I get older I think we're going to have to consider something that does all the work itself.  I did take off the handle it came with because that handle is so short (who thinks that was a good idea???) and bought a broom handle at the hardware store.  It does constantly need tightening (like, about ever 5 presses on the thing) but I'm now wondering if maybe plumbers tape or plumbers glue might work, hot glue? (is that waterproof?).