Definitely a must no matter if a M-Sport or not. You don't need it on the sides as the non M-Sport has the black moldings but definitely the front (mine on the front goes to about foot or so of front hood, fenders, etc, also headlights and front side mirrors).

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2008 X5 4.8
Jet Black/Black Nevada/Dark Burl Walnut
Adaptive Drive
Premium Pack
Tech Pack
Climate Pack
Sport Pack
20" Wheel Option
Premium Sound
Sirius Satellite
Rear DVD Entertainment
Multi-Contour Seats
Comfort Access
3rd Row Seat
Heated Front Seats
Running Boards
3M VentureShield Paint Protection Film