I'd be interested to know how the lower wave models work out of curiosity. I thought someone else posted that they bought one of the smaller battery operated models like that, but that it was a "sonic" cleaner, not an "ultrasonic" cleaner, which, the OP (I believe) said is not the same thing and would not clean like the ultrasonic machines. Was the one you bought sonic or ultrasonic?
It was advertised as "ultrasonic" but who knows what the industry standard for "ultra" is?