I might be wrong, but Rob doesn't make those products. He has someone make them for him. Where the cylinder porting is "his" work.
I've heard good and bad things about Rob too. But they're ALOT of people around here (MI) that arn't happy with Rob's work or customer service and wouldn't buy a shoe string from him.
I've never Dealt with Rob so I dont have a personal opinion on Him or his work, I was just stating what I hear about him localy.