I usually find that AB seems to be generous with their offers, especially during events like this weekend's happening at AB glenmarie. Ingress is ok while quill is usually very sticky with their pricing..
As the SA says, there are 2 portions in the offers, one that is afforded by BMW and another by the dealers themselves. Usually, the ones with the greater financial muscle and volume usually offers a better deal. But that is also SA dependent.
I'm looking at at pre reg 520d and made my first offer which was rejected, and I'm playing poker with them. Well, it's the year end season and for a commodity like a car, I can wait because I'm still young LOL