Shoptask: order with ballscrews or not?

The Shoptask is a 3-in-1 with a 17" swing (8" over carriage)
and 20 inches centre to centre: http://www.shoptask.com

The reason I am looking at it is that it is already set up
with timing belt pulleys in preparation for cnc motors.

Although they have preloaded pairs of acme nuts, they also
have bolt-on X&Y ballscrews available (for $699).

Does anybody have a Shoptask (Shopmaster 2000), and can
they tell me how they like it? Did you get Acme or ballscrews?

Also, anyone's comments on the optional QuadraLift (power
millhead raiser/lowerer 0" to 21" above table)?

Thanks for your help....

Doug Fortune