I also know that in the second movie, the sequel, Eric made some huge advances with the robot suit. That just made it even better. You put the suit on and moved your arms then the robot's arms would move in sync with yours.
I have times when I doubt what I'm doing. When those moments hit, I think about how grateful I am to be able to do what I do every day. It was harder when I started because I didn't see the response, but now I'm out there playing for people and seeing them happy, which makes it all worthwhile.