I know how you feel. I flew mine yesterday, but had a little problem, so I got only one flight. The only reason I can see to open it after its done is if you break something. Some people have been known to put a more powerful motor in it. Along with a bunch of other mods. I am flying my third EZ now. I crashed the h*ll out of this one a couple of months ago but repaired it and it flies great.
Have fun,