I went through a lot of the same issues before I ordered mine. Drove them both before ordering at the BMW driving event which was a blast. Both were hands down better than the E-350, Audi A-6 and Lexus GS-350 there to drive. What won me over was the HP & Torque and the fact that once I added everthing to the 535 there was a smaller price difference than I had expected. In the end I thought the 535 was a great car but the 550 makes a statement.
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