I spoke with Mike @ Motech re a map on the scirocco a few months ago and finaly managed to get the car down to him a few weeks back.
Firstly he checked the car over with VAG COM for any faults, the after apply the new map he took it for a spin him self to check it out, afterwards it was my turn to drive.......
I would recommend Motech highly, his customer service is 2nd to none and price wise hes very competitive