Another Power FC user here. It actually came off Steve Linton's time attack car before he went Syvecs. They come in at around £800 with a commander. They are a good ecu, and I have been happy with the results, the knock sensor feature is a good one. Although Syvecs would be my prefered choice if I was ever to change, for 2 simple reasons.
1. Other people have shown that this is a VERY capable ecu, that always hits good numbers in a safe way.
2. The features on it are worth the extra money imo. To buy all the features separately would cost ££££ more (Racelogic, datalogging etc).
For the mappers in the UK, I have had Ryan and Matt from AFR both map my car. Both were very competant mappers, and got the car to where I wanted. I did like the setup at AFR when dude and Matt were there, as any mechanical issue could be resolved at the same point as mapping.
With Ryan and Charlie at SRR if any problems arose, the mapping session would be aborted and you would have to get things sorted elsewhere before returning to have mapping completed. Not a problem for the guys that live quite local, but when you are travelling a 400 mile round trip it becomes a big problem...