our car came with the 3rd row seats (didn't have a choice not to get them) and NO adult can fit in them. I got in the seat just fine, but your femur needs to be half the size of a regular adult to be able to fit there without touching the 2nd row seating!

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2008 X5 Black
Active vent. seat Package, Cold Weather Package
Premium Package, Premium Sound Package
Rear Climate Package, Sport Package w/ 20" wheels
Technology Package, Active Steering
Comfort Access system, Running boards
Comfort seats w/lumbar support, Heated front seats
Heated rear seats, Dark Bamboo wood trim
3rd row seat, Park Distance Control, Navigation system, Head-up Display, BMW Assist, HD radio, Satellite radio, Rear seat entertainment, iPod and USB adapter