I got my ebc put in at boostworx the other day for a very reasonable price (the cheapest i could find) and cant say a bad word about the service, my car was in and out in 2 hours as agreed with the ratios checked and a new power readout.
I have been to a few other performance shops and have been overcharged and dissappointed..... IMHO it's not always a case of "you get what you pay for"
As for servicing and fitting stuff like g/boxes etc... i have and always will take my car to nisscare (pt adel) where i usually deal with brenton (on leave atm). Good prices and always reliable.