Product review (2 stars): By hand is more efficient!
This is a great idea in theory.

-- The bucket spins so leave room for it to do so.
-- Turning the knob is like a sport. If you can get it to turn at all, you might be able to get it to keep turning if you're lucky! Otherwise, very hard to turn! If your hand gets wet, it will be impossible to turn.
-- I find my clothes to still be fairly dirty after using this. I don't believe it has the power in a weak spin to truly clean this way. I think for delicates, it's decent but seriously, by hand is way more efficient in this case.
-- Noisy while it spins but it's not crazy loud. It almost sounds like a children's remote controlled monster truck.