The difference is his technical knowledge and working practices are known to be bad, he doesn't even road test cars after mapping, that isn't opinion, its a known fact.
He's been drummed off 22b, SN and other sites and its Andy forrest who first called him dung khan, so take what you want form it, but when you get the top mappers/tuners in the country saying he's bad then it's up to you if you want to believe it or not.
It sounds like you have been lucky to say the least, but sooner or later it will bite you in the **** im sure.