tim, it's not for pro tools
motorized faders are great because you can record the track and mix it all, save your mix with all your automation (fader movements, eq changes, etc), and then in a weeks time, you can come back to it, and it will be the same mix, with the same fader movements at the right times. now, if you use outboard, you may have to alter some compressors or whatever if you want to go back to a mix from a week ago, but if not , then it's a great tool.
it's really handy when you've got a lot of stuff going on in a mix becuase you dont have to have your hands on so many faders.
check and see if any of the units offer automation for eq's and on board compressors aswell. this may be handy to you.
-Romesh