Anything that makes the gti a bit oversteery is a bonus, not a hindrance. Its a real nuisance and pretty much impossible to do these days with all the nannying built into the car. You can't even left foot brake.
And the extra tread depth at the back only lasts for a while, so how on earth do people cope when they are at 5 or 6mm and the fronts at 3 or 4? If they can't cope, then maybe they should get something even easier to drive..
And talking a bit from experience, I have had golf gti mk1's, 2's and 5's. I used to tarmac special stage rally the 1 and 2's...
Having said that, I'll chuck it off next time it rains, lol.
Oh, Kwick Fit Fitter by the way. :)