Cheaper Alternatives For Clarisonic

Do you squeal with joy upon finding a much (much) cheaper alternative to an expensive beauty item? Of course. At any rate, you all know what I've had to say about my Clarisonic, but at almost $200, it's most certainly an investment. For about $150 less, there's the Pretika Sonic Dermabrasion Facial Brush ($41.50). While I haven't tried out this much (much!) cheaper version of the expensive original, I'm wondering if you have. If so, tell us all about it. Is it as good as the highly sought-after Clarisonic, or is it a cheap imitation?