Love my GTI. Drive it like a baby or rag it. Its fast (enough) - sticks to the road like glue and stops well.
Ive had some grief with the Infotainment system (had it replaced once and the software updated three times). I didn't buy the R or any of the 300bhp cars out there as I simply wont use it. The GTI simply does all I want - and the R wasn't out when I ordered

Extras.
The sunroof is great (and auto shuts on fob).
The performance pack makes the brakes phenomenal and the limited slip diff is great.
Keyless entry is a gimmick as is keyless start.
Check the 2 sizes of Infotainment as I wouldn't bother with the large one again.
Winter pack - well the heated seats are great
B-Xenons are terrific - gets you beam bending in corners
Voice works great
Acc is fun but a gimmick
Park assist is a gimmick
I wanted the rear cameras but they stopped doing them - retro fit £1000 (haven't don't it)
The boot liner lets all your stuff slide everywhere.
Best of all is the Intelligent cruise control - set your max speed and if you catch up the car in front, yours slows down, and then keeps pace to your maximum - no pedals.
32ish mpg - can get 37ish in Eco if you take it real easy and I don't do long journeys when I expect it could get its advertised 40mpg
Hope this helps but please remember this is only my opinion