Thanks for all the feedback guys.
Woow. I am now a bit hesitant about this whole deal. I love the fact
that I have a full size spare in my 325xi, which until today I still
haven't used. Why BMW didn't make run flats an option is beyond me. I
might have opted for them, but after reading all the discussion about
them I just might have opted for regular conti's. Now it seems I don't
have a choice.
But again, thanks for the links and the feedback. Her car will come
with the Conti runflats, and the ride was awesome (at least during the
short test drive she took with it). She didn't get the sports package,
as she hates getting in and out of the bucket seats in my car (she's a
petite). We'll just have to see how it goes. And if we don't like the
run flats, I'll get her regular tires and a repair kit that we'll
store in that "extra cargo space".
She did get the premium package, which includes BMW assist.

There has been a lot of discussion in the E60 and E90 forums on
Roadfly:  http://bimmer.roadfly.com/bmw/forums.  The main
objections center around poor ride quality, short life (possibly
due to early manufacturing problems), cost ($460 per tire in
some cases!), and failures that leave you on the side of the
road (which isn't their objective.)

FloydR

Does anybody have experiences to share with runflat tires? We ordered
a 328XI Sports wagon for the wife last week. Great car. I am jealous
at all the standard stuff she gets compared to what was optional when
I bought my 325xi 5 years ago (she even gets angel eyes, which you
only could get on the 5 series back then). They all come standard with
run flat tires (at least here in the US), which sounds great from what
the dealer told us, but I have no experience with these. There is no
spare tire, which offers quite some extra room in the cargo bay.
I don't know anybody here either that has ever had a car with run
flats.
Not that we seem to have a choice, but I am still curious to hear
about experiences from others with these.

Thanks