Thanks for the mixed feedback.
I don't really want to pay someone £250-£300 for 30 minutes work, when ECU Evolution will do the exact same thing for £150.
Or am I missing something?
Ask them if they load test the car on the dyno, and take logs both before and after tuning to ensure everything is perfect.
Anyone can flash a tuned file to an ECU, but I guarantee you won't be getting a proper service and adjusted map to suit if required.