Brian, I agree although I am one of those guys that has bought used vfds with no problems but you do have to get the better stuff. The PP people are pretty adamant that their system does not produce the same " chopped up" -my non technical term- waves the a vfd does. Don't know the real deal but my machines seem to run stronger than on my Kay. All pretty subjective though. If you find a good used PP in the $1500 range it is worth the risk as the company is very good about repairs if needed. Mine have been fine an the quiet is nice. Dave