I have these two. The first is a cordless unit that uses "ultrasound technology". The second is a true ultrasound machine. They both gently vibrate junk out of the pores and exfoliate the skin. The second, being a semi-pro machine, obviously works better, but the cordless unit does a pretty good job too. They run about $250 and $600, respectively, but there are deals out there to be had if you look.
Bellaire Industry Ezzi Spatula
Bellaire Industry SkinSpatula