I finally got one of these, a 120W 3.2 liter model. I cleaned some MX Blacks in it, and I can't tell a difference. I don't know if that's because they are just scratchy and not dirty or because I didn't clean them right. I did two batches: one with two offbrand camelbak cleaning tablets and dishwashing detergent and one with two tablets and dishwashing liquid (lathering kind one uses when washing in the sink).
Possible sources of error: I only washed them for 8 minutes a piece, and this wasn't long enough for the water to get above ~35 degree C. Cleaning tablets weren't completely dissolved the first time.
As another test, I put the bottom piece of my Aeropress in it and cleaned it for 20 minutes @ 50 degrees C with just the dishwashing liquid. It cleaned maybe half the gunk off of it (it had some weird brown [coffee?] gunk in the crevices).