op: This is my experience and opinion of the GTI. This is my 5th year with it.
I may be in minority here but GTI is not at all comfortable for me, I have no DCC though. I am actually considering getting rid of it for that and few other reasons.
Around where I live roads are terrible and you can literally feel any imperfection on the road...nice tight handling doesn't come free I know. I have stock wheels with PS4S (225/40R18).
My other gripe is seats, they really need some more lumbar support as I come out of the car with the stiff lower back after only few hrs of driving and I wish they had little less bolstering as well...oh well.
Not sure if op is getting manual...I have manual gearbox, and quite frankly it is not the best, I would dare to say that it sucks. Out of the box it's clutch action is vague with inconsistent bite point and I did all the usual mods removing the CDV and spring assist assembly, it is improved but still kind of clunky.
Pedal arrangement is also not that great if you are manual driver...they are located kind of high of the floor.
Car eats coolant for some reason, I've had two different dealers do a pressure test and visually inspect, couldn't find anything wrong, no drips under the car either. Every 6-7k miles coolant hits min line in expansion tank...go figure, I gave up on it. I bought container of G13 coolant that I keep mixing with distilled water and adding every time it hits min. Most likely the infamous thermostat housing or crappy VW water pump. They are guaranteed to go at some point.
Again if you buy a manual, some people have started experiencing crank walking issues. This is a big one where the thrust washer falls out of the crankshaft into the oil pan and in the process engine destroys itself. Mine hasn't shown any signs of this , but I keep thinking what if...
Out of warranty I had to replace upstream O2 sensor (threw a CEL) and sway bar connecting links. One time got EPC light that went away on it's own.
Gas mileage is great unless you have a heavy foot and you drive in a lot of stop-and-go traffic. Cruising speed limit on the highway, you will definitely exceed mpg rating in the window sticker.
It's a great little car that does lot of things OK but none great. I think I am done with it though. I have GSW as well, so that one I intend to keep around for awhile.
Good luck with your purchase.