Thomas (TPPJR) has both a powered drawbar and the Tormach quick change system. I would be curious to hear his thoughts on the quick change system. If I had a powered drawbar, I'm not sure how critical it would be. Since he has both, I'd love to hear what he sees their relative benefits as being.
In terms of standardizing tool heights, I wonder if something like Tormach is even required? I've got a surface plate and height gage. It doesn't seem that hard for example to set standardized heights that go into your tool table in mach. Take a look at Thomas' rack for the holders, which makes a nice way to be organized.
In any event, if he could weigh in with comments, we'd all learn a lot I'm sure.
Take a look here for his web info on this stuff:
http://imageevent.com/tppjr/rf45dovetailmill
Best,
BW