I got my X5 used 2 yrs back, did PPI and it did come up with hoses and some stuff that needed to be replaced, which the previous owner did before selling the car, it's been fine so far (2005 x5 4.8is), honestly I am scared of the expensive issues that I see some of the X's owners have discussed that I thought about trading it in for a Lexus ( not like I was having any issues, just the things I read in the forum made me want to trade in), but then I did drive the Lexus and well it's not something I think abt while at work. the X drives so much nice, it's better than a 328 handling wise (my opinion) so much so that my buddy (335i owner) is not looking for a 4.8is as well.
I have put 5k in a separate account for potential issues I might have, however so far I've only had a dead battery (From a third party lcd monitor).
So in short drive it cause it does not feel like any other suv within it's price range if you love to drive.