I've had mine on track. Knockhill and the Nurburgring.
Knockhill was a bit crap to be honest. Too many folks with cars that didn't care.
Nurburgring was much, much better. Whole variety of machinery and drivers means there's actually a pretty good discipline as no one wants to get in an accident.
On both the GTI made a decent account of itself. My set up was a standard Mk6 GTI with DSG running stock everything bar a remap, 17 inch Monza's and Michelin Pilot Sport 3s. Brakes held up for around 3/4 of a lap on the 'ring after which I started getting pretty bad vibration from the discs which had warped. By far the brakes are the weakest link on the standard car.
Granted most folks would change the pads (at least) before going on track. But I didn't and this was my experience.