It's definitely worth the trip and the experience is fantastic. I did ED+PCD in 2008, went back in 2009 for 2 day M-school, and did the M-power experience in Miramas, France (Mike Renner and I shared a car). All of the instructors are expert drivers and genuinely nice people. For most of them, working at the performance center is their day job that allows them to race. call them 'starving racers' if you will.
Like they say in the video its both fun and educational and they have a bunch of courses ranging from new driver school on up through Advanced M school (which they hold at either Virginia International Raceway or Charlotte Motor Speedway)
Speeds at each school are taught progressively. You start slow and move up in speed.
Again, definitely worth going.