I guess it just depends on the SA's you get there. I had a bad experience with Advantage BMW Midtown in Houston, they were giving me a good discount but they were just marking up the MF, so I just took my $500 deposit from them and walked away. Their sales manager, Kenny, emailed me and asked if there is something he can do to make me change my mind and when I replied that they marked up my MF he replied back that it is a normal things for dealers to do that, I just replied back to him not to bother to send me another offer if he is thinking like that.
edit: BMW of San Antonio also wanted to get me in a deal with 0.00150 MF, when I heard that I said ok, I will walk away, after that my SA said considering that your credit scores look good we will give you a 0.00130 MF and that is what they did. Plus the fact that I was in touch with this guy for a long time, he has just kept his patience and got me after that to get a car from him.