These brushes provide intense exfoliation that strips off the natural protective layer of your skin. This may lead to over dryness and irritation to your skin. If you do end up purchasing one, do purchase the softest brush head they have.
Anyway, do not use it over twice a day or you'll exacerbate the oil production of your skin which may then lead to more acne. Regarding price; you can buy a similar brush for a fraction of the price from many suppliers such as Proactiv or University Medical