G'day to all from Tasmania, Australia!
I happened upon this forum in my search for suspension modifications - and what a find.  This is definitely the best source of information relating to Mk5 GTIs I've seen.
About me: 59 y/o male.   My first car was a '72 Superbug, which was eventually traded on a Mk1 Golf GLS in 1977.  Then came a multitude of cars including (in no particular order) many Toyotas, a FIAT 131 Superbrava, a Datsun 120Y (!!!), numerous Subaru Libertys and an Alfa 147.  I've had my current car - a 2007 (MY'08) tornado red 5dr Golf GTI in manual which currently sits on 98xxxkms (~60,000 miles) - now for nearly 10 years.
At the moment I'm tossing up whether to keep or sell.  TBH the jiggly ride has bugged me from day one when I drove out of the dealer's driveway.  So I'm researching suspension modifications before making any decision.  Otherwise I love my GTI and 10 years is by far the longest I've ever kept a car.  Usually I'm getting itchy feet around the 2-3 year mark.
Cheers
Steven