I use only the ATI balancer myself. Worked with a machine shop that did only race engines, and he said that there were only 2 things he had ever found that did not need to be "fixed" when buying out of the box parts, one was a set of $15K Chapman Racing cylinder heads for a Windsor (at $15K they better be perfect!) and after testing the ATI baslancer on at least 200 applications and none of them was off by even 1/10th of a gram, and lined up perfect with the degree wheel, he quit testing them as well and just used them straight out of the box. But that is just my experience. If it was me, I would sell the "pro" products dampener and buy an ATI.