People will 'forum bash' some companies, on One they will be the absolute worst place to take your car to and on another they will be regarded as the best tuners since man Invented engines.
People will say things like 'they dont write their own maps etc...' but in reality from the contacts I have in the tuning industry in the UK I can count on 1 hand the number of people that offer remaps and actually write them themselves, most are bought in.
We supply software to 20-30 tuners in the Uk and they claim it as their own, doesn't mean it's poor quality just because the tuner that flashed it to the ecu wasnt the one that wrote the code.
What is far more important is that the car is checked and datalogged then adjusted accordingly, ideally with the use of a Dyno to measure accurate afr's etc...