I went to an open day at ProPilot last month and was actually really impressed even tho they're new. Talked to some current students who were v positive and the iPad manuals are fab- animated graphics and videos in with the text and revision layers as well. Plus they were really nice and friendly, small classes etc and I got to go on a 737 walkaround with a training captain and have a sim session!!!
Ring round the different schools and try and visit them, that's my advice, then you can see them in action. I'm going to sign up in the new year. Hopefully Santa will bring me an iPad...
