Saw that on ebay recently as well and thought it was expensive for what you would be getting. I dont think this part of their description is correct,

1.5Kw frequency Stepper drivers:
Input Voltage: 220V-240 V, 50/60HZ
Output Voltage: 0-240 VAC
Output Power: 1.5 KW
Output Frequency: 0-400 Hz
Output Current: 7.0 A
Capacity: 2.8 KVA
Overload Capacity: 10.5 (60s)(A)

It should be describing the VFD not the steppers.

Also note that you get 6 months warranty with the spindle and not 12 months as for the rest of the machine.