Product review (3 stars): The good, the bad and the ugly, or Cheap unDirty by the Dozens
We received and used this today.  Upshot:  for us it will usually be better to handwash in the tub till we get a plumbing revision and replace our old washer and drier, BUT this should still be very handy for loads that are quite dirty, so it will serve a purpose, and it should be handy during droughts.  The good:  the tub itself is well made.  The bad:  the support rails are not well made.  The ugly:  those rails again.  Cheap:  the rails, the suction cups, and the cost which is about four dozen dollars currently.  The "undirty":  fifty cranks of a pair of jeans and a light top with about
a gallon of water and a tiny bit of liquid detergent came very clean.  So, for some who need a low water, small space solution this is going to be a real win.  But it has no other benefits or differences over hand washing, so those with a tub will not need it though it can be handy if you have some dirty loads that you woukd rather not do in a tub.