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If it's the same Area 52 that I've heard about then there was a real horror story about their mechanical work that ended up in a legal dispute, I don't know anything of their mapping skills though.
I've had stuff done there and the car's fine over a year later and found the guys to be very helpful. Not had mapping done though. There was a legal dispute over an engine failure which I don't know if it got resolved. Last I read on here there was some report that was going to be posted up with the findings, but it never was. I know a few people that have gone there and they have said positive things. I will use them again.
Not used them myself but if scoobyclinic is near you, you might want to consider talking to them too. Ive never heard a bad word about them myself ....