I've used Superchips (Detection Techniques) since 1990 on many vehicles and never experienced any problems.
I've now been using the bluefin on my 2.0 PD140 Tdi for 70k. A friend has a 2.0 TFSi now on 80K. Both without problems.
From my experience, and listening to hearing of horror story's of other company's, Superchips as they have been trading so long (one of the first) I'd not use anyone else other than Litchfield motors in Gloucestershire..