If you want to stick with a BMW dealer for service - the extended
maintenance is a good thing. It has to be purchased while the original
factory maintenance is still in effect. Wish I could get it for my
E46/M3 - where a Service-II runs from $1,200-2,000 depending on the
dealer (seems California is the most expensive..)

You can pretty much plan - that IF you use the miles so you're near the
100k mark when the extended maintenance expires it will have paid for at
least 1 Service-II, perhaps 2 depending on how hard you drive the car, 2
Service-I's, and 4 oil changes. Brakes are usually a 40-50K mile item
depending on how hard you drive the car - so if you get one set under
the original maintenance, you'll probably get another set under the
extended warranty.

If you add all those up - you're looking at perhaps $2,000-2,500 worth
of service, and you're paying somewhere near half that for the contract.
Good deal - IF - you actually do put the miles on. That is where the
catch is - I suspect most BMW owners don't put that many miles on their
cars, so BMW makes out on the contracts.

Certainly if you're comfortable with an independent - who can do the
work and document it so your CPO warranty stays in effect - it will
probably cost you about the same amount to have it done by the
independent as the contract costs - perhaps a bit more.

Like I said - wish I had it on my M3..