I have just run through my break in period.. and the 100+ miles of driving around at low boost up to 5k rpm..
All is good
Gave it a boot full.. held 1850 PSI all the way to redline.
Car actually feels more peppy too..
Good luck mate
And for what its worth, I have read the GTI problems, and there was an initial freak out on Mazdaspeedforums about 18 months ago about this issue..
Many people pulled things down and no one found any issues.. Thankfully mazda may have made something a little better than VW for once.. just maybe
Doc