They're literally 2 mins from me and supposed to be decent although I've never used them.
With this said I'll be using Devil Developments in the new year as I'm be needing a custom remap on my hybrid set up Cupra R and they're very familiar with these cars.
I was speaking to some one from amd and he was saying that they don't map cars they haven't worked on or checked the engine over first. As for recommendations I would go to redline tuning in Essex. I know exactly how to get there lol but think it's basildon.
Richard the owner and the mapper is brilliant. Straight to the point and no bullshit. He tells it like it is. He said to me once "if you want pub figures you might as well go else where". ( basicly bullshit **** numbers making your car sound better than it is)