The BMW 7 inch NAV screen is beautiful and so well integrated, a separate GPS unit will never achieve the same asthetics. To me its worth the trouble, especially since everytime I get in the X5 I am reminded of what I'm missing in my 540.chivas said:you're better off getting a separate GPS unit then putting the factory one in. it's a PITA from what i've read and it's not for the faint hearted. you don't have the wiring so that's gotta be added from the trunk and pulled to the front. sounds like fun eh?