Had a remap done on my 03 oil burner a few days ago by Pendle Performance. Would have gone to R-tech if they were closer to me - Pendle are still an hour or so away from me so I only had to take an afternoon off - and there was an eBay deal on for just £185, admittedly with no rolling road session.
I was looking for better economy (as well as any performance gain that I have to put up with!) - doing my normal 12 mile commute of very mixed road types (winding streets and lanes as well as a few miles of dual carriageway) the consumption has increased from 50mpg to 55.
So I'll get my money back in a couple of months, (honestly dear!!)