Re: mill servo conversion ?'s

Continuing in my search for a suitable servo system, I thought I'd ask
if anybody has any experience with this guy:

http://www.smidgie.com/ncgear/

he also has an auction for the motors here:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=42920&item=3832692273&rd=1

I know the page is pretty sparse, but he has some personal conversion
pictures here:

http://www.smidgie.com/928/machineshop/

I guess my questions is, what are the pitfalls of using used motors?
But primarily I'd like to know if anybody purchased and is happy with
these motors and/or power supply kit.

thanks, as usual