Hi,
Just like to post my experiences on the bluefin.
Originally owned a GTI V which traded in for a ED30, both have been running the bluefin.
I have had no problems what so ever with either.
The ED30 is just "mental" power delivery which is unusable on anything but bone dry roads or a very careful right foot.
The GTI V with bluefin is more usable, just right with earlier power delivery, yes I know when the bigger K04 gets going the ED30 goes into warp drive, but then its difficult to really open the car up on uk roads. Great for santa pod or a german autobahn I suppose?