Hellow i m planning to buy x box 360 arcade from grey market is it ok and does the rrod heappen in it or not?

plzz let me know and they say they are going to modify it so what is it


and is it ok to buy from there without sealed pack for rs 18000|||they are goin to stop making x box 360 arcade and start on x box elite get elite it has a bigger hard drive and that makes it have waaay better memory