Stepper motor on Ebay

I was looking at Ebay for a few stepper motors and saw a listing for
these (ot of 3 SIGMA STEPPER MOTOR CNC NOS 635oz/in). Does anyone
have any opinions on these. Are they worthy of the purchase or not
sutable for hobbiest. If so, any recomendations on controllers. I'm
contemplating using EMC and other software as wel. I have a Micro
Mark Mini Mill that I want to convert to CNC. If these motors are not
worthy, then any recomendations for the Mini Mill.


Thanks,
Shawn