is this kit any good

[CLAYTON]

Dear wiatroda , why you may use PM752 instead of PM542 . I think both are good options I have not found any problem in using PM 542 .

[Jonathan]

Dear wiatroda , why you may use PM752 instead of PM542 . I think both are good options I have not found any problem in using PM 542 .

PM752 is 75 volts, versus 50 volts for the PM542. Motor top speed is roughly proportional to voltage, so 75 volts will allow the motors to run significantly faster - hence get PM752 if you can afford them!

[wiatroda]

Dear wiatroda , why you may use PM752 instead of PM542 .

Jonathan is right. more voltage = more torque at higher speed.
Please google: stepper motor basics for some related articles or/and you can visit http://www.diycnc.co.uk/html/stepper_basics.html and other websites