Product review (2 stars): Disappointed
I live in a condo which has a laundry room, so a washing machine isn't an absolute necessity.  However, I was beginning to find it inconvenient to pack up my laundry and bring it over (and sometimes finding all the washers in use).  Laundry was beginning to back up.  So I began to think I could start washing at least clothes and lightweight items by hand, and watched a few videos featuring the Wonderwash plus spin dryers as an alternative.  The two items together seemed to create an elegant, energy-efficient system.  So I purchased both Wonderwash and the Nina Soft Spin Dryer (both by The Laundry Alternative) and I was actually excited about washing clothes by hand.
The good news is, I have found a lot of wash can be done quickly and easily by hand.  The biggest change to old-fashioned hand-washing is thanks to the Nina Soft Spin Dryer.  (More on this later.)  However, I cant say that the Wonderwash has performed as well.  In its favor, it does do everything as promised.  My complaints are:
(1) The suction cups at the base do a great job of holding the unit down, but do not prevent it from sliding sideways, especially when the surface gets wet (which is always).  And when you want to pick the unit up after use, the suction cups have to be released one at a time.
(2) I tried using to spigot to release the water.  This should just twist on the valve at the base, water being released when its twisted a quarter turn.  The times where this works, the water leaks  a lot -- at the point where the valve joins the spigot.  Sometimes I cant get the spigot on the valve at all.
(3) The other option for water release is to just tip the Wonderwash upside down and let the water out through the top.  This works well in some places.  But if you are using the Wonderwash in a tight space (a tight area near the kitchen sink, for example), you might have to turn the whole unit, so that the handle (which is probably positioned to your right for turning) must be turned to the front or back, so that you can tip the water into your sink.  Here again, the suction cups make simple turning into an awkward operation.
(4) The quality of the wash seemed fine, but I am not sure that it is any better than a wash in the sink.  I probably would wash really dirty clothes in a commercial washing machine, but even when I purchased this item, it was only meant to augment my regular washing routine.
(5) The last reason to consider before buying the Wonderwash is that if you think you can easily return this item if you are not satisfied, my current situation is that I am finding the cost of boxing up and mailing the Wonderwash will just about cover what I paid for it in the first place.
To sum up, I am finding the Wonderwash to be awkward, messy, and now taking up valuable storage space in my apartment.  I am sorry, I really wanted to like it.  If you are thinking about a manual laundry routine, I would encourage you to buy The Laundry Alternative Nina Soft Spin Dryer first and use it in combination with a simple sink or plastic basin for a washer.  The Dryer takes all the water-dripping mess out of hand washing.  After washing and rinsing, you just move your sopping wet laundry by bucket to the Soft Spin Dryer, and in a few minutes, you have a laundry load that is dryer than after the spin cycle of a regular washing machine.  Your clothes are then ready to be put on hangers or clothes rack for no-drip drying.