Are taper lock pulleys a good choice for ball screws?

[Muzzer]

I've got a feeling muzzer is using servo's which have much higher torque than steppers.!

Yes, my machines are a 3.5 tonne Shizuoka, a 1 tonne Bridgeport milling machines and a Colchester lathe. The ballscrews are mostly 32mm and 25mm and they all have servos, so as Jazz says, the application is a key part of the decision.

Personally I wouldn't consider the additional moment of inertia of a taperlock pulley to be a massive concern if you have a long 20 or 25mm ballscrew but if you have steppers, I guess you may struggle with speed and response as it is. Without a high drive (power supply) voltage, the torque output of steppers quickly tails off, so the headline torque figure may be misleading. If you are still deciding what to use on the motor front, this may be a good time to consider something better and Jazz has good experience you can learn from on that front.