First off, I should warn you that my skin did get worse before it got better. I kind of expected this - like when you go to the salon for a facial, it will stir up the sediment and open up pores that were closed. However, after the first week or so, it cleared up and is now amazingly clean! My face feels SO good after using this brush. Clean, but not that dry, chemical clean that makes your face feel tight, just... well, clean!
I've tried a few different cleansers, including the sample that comes with the brush, and haven't noticed too big a difference. Light, thin liquid cleansers seem to work best, though, which is what the Clarisonic one is like.
Overall, I'd say well worth the price, especially if you have oily, acne-prone skin like me!