Good looking car. I was as chuffed as you look in those photos when I picked mine up. I had had 9 months with no Z by that point, so was aching for it!
I ummed and ahhhed about those 19’s for ages, but my sensible side won in the end – but I do love them.
As for the interior – I think it’s a great choice. I am all about the wild/different interiors (if you’ve seen my post). My previous Z4 (2008 2.0 M Sport in Space grey with Black leather and piano black trim) was great and I really liked it, but I think the style of the new interior lends itself to deviating away from black.
Regarding the drive – I too can confirm that it feels much more grown up and solid. As an example, having washed the car a few times, you can tell there is no flex in the front or rear bumpers, whereas the old one would move a bit even if you pushed not very hard at all. I parked next to an old Z4 a few weekends ago and the old one looked so small in comparison!
Finally, on the run in – I have opted for the gentle 300, then sensible, not exceeding 4000/4500 revs approach for the next 1000 or so. Got another 200 miles to go, then will start to gun it. To be fair, the nature of the engine and low down torque means it is pretty easy to drive quickly, without stressing it at all, in the run in period. Interestingly, the service interval has not moved from the original 18000 indicated, despite me having done 1100 miles. Have the 5yr service pack, but am going to pay BMW to change the oil anyway. Can never be too sure.
My favourite thing so far is how the exhaust pops as you come off the gas. Get a bit of acceleration (hardly any required really) in a car park, lift off and enjoy the noise!