I'm currently updating a Fehlmann Picomax 50 CNC. I need to replace the old 3.3NM steppers on the x and y axes and am inclined to fit closed loop steppers like the Leadshine hybrid servos. However, I came across these JMC closed loop motors on eBay and just wondered if anyone else has had any experience of them?

CNC Hybrid Closed loop Stepper Servo 2HSS86 Driver + 4.5N.M Servo Motor +Encoder http://r.ebay.com/4qoOSP