If you feel like you've ‘made it,’ and you're completely satisfied, you have bigger problems.
Even the best fall down sometimes.
I am one of those people who is never satisfied, ... When I was a little kid, I made a spaceship out of a refrigerator box, and I was pissed off that it wouldn't fly. Couldn't be happy with it. It was pretty cool, too.
The day it comes out, there's already things that you start to go, 'Oh, I should have done that a little differently.' You start to make a list in your head. I actually write things down -- what I'm going to do next time.