bigx5e, here's some answers. Hope they help.

Did you own a E53? - No.

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 - Ride is not harsh at all.

2. Build quality -- every E53 I've owned (3 of them) has had rattles from the tailgate and sunroof. No rattles or squeaks yet. The cabin is silent even at highway speeds.

3. Electronics -- do the rear parking mirrors work well, does assist/bluetooth work well? Everything working well. Bluetooth sync was a breeze with my Motorola Razr V3.

4. Tires -- what are the stock tires you have? Since you have a spare I'm assuming you avoided the run flats. I have the standard run flats. I'm just as surprised that they put a spare in. Good, common sense item.

5. Front driver/passenger room? Nice and roomy. The cabin feels small but I think it's an illusion created by all the leather and wood.

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.[/quote]