Same guy used to sell these on ebay under the name Powerchips.
I had one for my 16v and it worked perfectly fine for over a year, car felt smoother and more responsive, but no dyno figures to prove any of this. Petrol consumption didn't seem adversely affected by the chip and my car is mostly used on the track and getting to and from the track.
I believe his chips are a copy from someone else's.
I have now got an R-Tech chip fitted which was based on the standard software chip for my car, this seems much much better than the standard chip and the Powerchip I have been using. Plus it is tailored on the standard software for the car model and not a generic one fits all type. I have yet to test the chip on the track but on the road it is much improved.
I would suggest you contact Nick at R-Tech (in the remapping section) if you want a chip for your car.
Paul