""Derminator"", there is a whole long mega-post about microneedling at the top of the scar treatments sub.

Hey, I use angel kiss(removed link - no advertising here) derma roller 0.25-0.3 mm for the face and ZGTS derma roller forthe stomach (have stretch marks after baby's birth). The results became noticeable after 3-4 uses. the procedure is quite painful so I use a special anesthetic cream. In the future I plan to buy dermapen with different lengths of needles; I have read a lot of positive reviews about them.