one of my favorite things to do with my sensation is flash other carrier/regional RUUs. ive used superSU to root several stock ICS builds,and even to fix the superuser issues on a couple of rezound custom roms.
glad you got your root,sorry i didnt catch you before you unlocked again.
for what its worth if you do need to make a warranty claim,you can
relock,run ruu,s-on,reunlock and root,s-off again. at this point your back to locked
so you can then ruu and s-on,and be 100% stock.
so there are some extra steps,butlocked
is technically still possible
i got my rezound used,so i could care less about warranty.i re-unlocked mine imediately