Sorry to hijack, but I'm in a similar position with my 170bhp 2012 2.0 tdi quattro...
I live in West Yorkshire so based on popular tuners in my region, many forum posts would suggest that I head over to Rick at Unicorn Motors, who has claimed that about 190-195bhp is the max for my engine (without removing the DPF, anyway). However, I've seen several people recommending a company called West Yorkshire Tuning - which is obviously much closer to me. I've been in touch with them and they claim a huge 220bhp without hardware modifications. They're also over £100 cheaper than Unicorn. I'd normally still trust the reviews of the majority and go with Rick, but given the proximity, the reduced cost and, most importantly, the huge difference in power claims, I'm struggling.
Can anyone offer any advice on either tuner, and how this company can make such a dramatically bold claim over someone who is widely considered to be on of the best tuners around?