I've ordered the 36 month service pack with my car but reading this thread I wonder if it's worthwhile. Since the car's not due to arrive for a few weeks I might cancel it.
Mike - thanks for the running in info, it was very interesting and useful.
To continue the "off topic" theme. I loved my Z4 and the obvious moved seemed to be to buy a new Z4M. I managed to loan one for a weekend and decided after a day that I just couldn't live with it. It was great fun, but in many ways it's just too focused for me to do a 50 mile trip to work. After trying a number of cars I couldn't resist the 335i Coupe.
For the summer days and so that I can try a few track days I'm also buying a Caterham Roadsport 165 in kit form.