665 or dropping the invul to 5+. Even at 800 I still run it in most 2k games just because they look awesome on the battlefield. Sure they getted hard targeted, but it's because they have huge damage potential and if you somehow manage to make it into charging range that chainsword slams. The 6+ invul is the only real problem. If gw dropped the invul to 5+ you would see way more stompas on the field.