My son got this "Really Cool YoMega" today at WOW. WOW is an after school children's program that does some kind of interesting activities. My son got to meet someone who was a "Professional Yo-Yo Guy for YoMega" (these are his words). He was doing pretty good this evening too. This, by the way, was taken with AI Servo. I am pretty happy with the AI Servo on the 40D, I get more keepers than not whenever I use it. I don't use it that often, I'm not a big action photographer, but when I do use it, it works.