me use 15"powerbk, 1.25. 1GBRAM, etc... All good, found a little lag when really pushing it with real vid files. Been workshopping it with 11 year olds in London. great for them with a midi keyboard. currently using it in installation in south devon (UK), if your in the area drop in to Dartington College of Arts, crossingtime festival (17th-18th Feb).
Also using various midi control - Edirol PCR30, icubeX, Dawsons Soundbeam (now this is really fun, specialy if you rig it up to reason at the same time...!) Don't you just love midi.