Well after a couple of weeks driving the Mk8.5 GTI and a long trip to the east coast (Yorks) at the weekend, a few thoughts on how it drives (though i've barely pushed it until it's bedded in).
Gearbox in D mode, i find it great for everyday steady away driving, however for a quick overtake there's a fair bit of lag and noise until it kicks in (something the Mrs isn't keen on), I've started knocking it into S to do the overtake (it's the first DSG i've owned so i'm a rookie here).
Love the car in Sport mode, really feels sharp and responsive, though for round town driving it holds onto gears a bit longer than i'd like and therefore starts to drink petrol.. i'm finding best balance is Individual mode to get the sporty exhaust sound but keep the gearbox steady for everyday town driving.
Most MPG i got is to the coast at the weekend at 40.8mpg but it's quite thirsty around town at the moment until it loosens up.
I had a 21 plate Audi A3 35 SLine for 3 years before this, i think this handles much better and is much sharper to drive, the car is much more maneuverable and nimble than the A3 was, the steering is more precise. Also the build quality is better inside than the Audi which had too much black plastic for me and no carpet in the door bins.
Very happy with it so far and a lot let to learn no doubt.