i have the kinetix HFC's and have been happy with them, i got mine 2nd hand, low miles on them for only £200, so couldn't see the point of turning them down at that price.
been on for over a week and no CEL's as yet.
i like the berks as the have fixings that bolt them into place and togehter which the kinetix don't, but both are a good piece of kit.
i'd say both are good but if you have the extra cash then go for the berks. if you don't then the kinetix will do a grand job.