X-Clamp fix is pretty hit-or-miss, I haven't had a very steady success rate with it or many other iterations of it. I'd say I have about a 55% success rate. Maybe I'm just trying to fix RRoD's that are just way too gone. I've had the hybrid x-clamp fix work for me first try, and I've had it work for me after 3 hours of adjusting the screws on the underside of the case. I've had oven reflows work and then fail. RRoD can't really be fixed I've noticed. I've done over 100 360s with the hybrid method and only about 30-40 of them still work.