Ed at autotech has tuned mine 3 times, never had an issue with anything (There is a few bad stories going round about him, but they're all on big hp numbers).
He's familiar with the nistune software and has done a good number of nistunes.
If all is well with the car it should only take an hour on the dyno.
With the stock turbo it came out at 215rwkw at 11psi. on a dyno that i know for a fact reads lower than ESP's