Your CA is right.

The difference is mostly cosmetic, the rims, the extended wheel arches, the blacked out trim on the windows, different steering wheel, and dark headliner, making it look more sporty. Suspension is the same, ride hight is the same, and handling is a bit sharper I suppose for the sport since the tires are more low profile and softer compound.

Not listed on their site currently however (maybe removed for new models?), but the one I have has a higher max speed limit than the premium & base...... not that anyone would get to experience the difference.

Completely worth the 2500 if you ask me. BMWs are sporty by nature, so why not complete the package?

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X5 35i Sport, Black Sapphire