Valid question indeed... For me it was more about reliability and if any issues were to occur how would it be handled as opposed to the claimed figures! The deciding factor came when I put up a post on a 'Audi Owners Club' page on Facebook to ask which was best... 90% stated DTUK was the best! They've also sold 25k units so far and are by far the best in regards to being able to solve any potential issues... My best friend whom just acquired a A4 B8.5 2.0tdi had one fitted, I had the pleasure of being able to try it out before/after the fit... And that was a massive improvement!
One thing was suggested to me by the owner of DTUK was not to change the programme immediately but to give it a day or so to ease it in so the car gets used to it gradually! Otherwise it could throw a wobbler and check engine light will go on... So I put it back to the original settings and will give it a few days before I gradually up it a notch or
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