registering JJ and switching os's

if i buy a new 2500 with the jj xl os installed can i switch back and forth between the other os's without paying?

Yo

"If the password of OS2XL is entered, OS1 and OS2 can be used without a password."

cheers!

also, what are the chances of an mpc bricking?

Well what can happen is that there can be corruption/errors when flashing the ROM, then you will be stuck in a reboot loop or something similar. But there is always the Window button+Power button mode available so it's pretty difficult to 'brick' your MPC

Just today I've reinstalled about 10 times....