[4runnerman]

I also looked at getting a ultrasonic. Did some research and decided not to go that route. Apperantly it get's them so squeeky clean that one can scratch the bullets during the seating step. I have one friend who does use one,but tumbles in media after they come out of sonic. Pictures of magnified case necks show some good scratches in the necks after sonic cleaning. Not from sonic cleaning but from cleaning them so well.
As for dust- I just punch a hole in paper towel and set it on top of tumbler and no dust at all.