21's here too - no issues at all.
It's all about perception really - if you came from a 15" fat tyre soft suspension car, you WILL feel it but if you had something similar (I had an older A6 on 19") there were hardly any differences.
Only real issue I find is because of the size profile, there is 0 protection from the kerb etc so you need to be careful when parking etc
Hi @Dam0 very nice car! I've had mine for about 3 weeks now loving it. The 21" seem to be 255/35 vs the 275/35 I had on my old a7. Slightly softer ride if anything compared to my old one. Definitely look a bit less easier to kerb with the Bridgestone Turanza tyres fitted.
Hi @Leebroath, in my old A7 the passenger door mirror only went down for parking if you left the control switch selected to that mirror but then it would not heat during winter. So you either had the mirror flip down for reversing or heated - no setting for both at the same time. So just check the switch setting.
After consideration I've decided to not go for the A7 55 S Line. Too many stories on here of rattles and I find myself very irritated by anything like that. So decided to pass despite a really good deal on the table.