Did you own a E53? Interested in your thoughts on:

1. Ride quality -- I've always found the E53 to be a little harsh over bumps, even the non-sport

2. Build quality -- every E53 I've owned (3 of them) has had rattles from the tailgate and sunroof.

3. Electronics -- do the rear parking mirrors work well, does assist/bluetooth work well?

4. Tires -- what are the stock tires you have? Since you have a spare I'm assuming you avoided the run flats.

5. Front driver/passenger room?

Thanks. It's great to here from someone who has driven one for a while. Test drives just don't give me enough of a long-term feel.