On mine ... mmmhhh let me see. I do have 2 things that bother me ...Here i go
1) Noises in back everytime i go over a bump... i am still trying to discover where those little noises in the back come from? (yeah i have seen the threads no luck yet... sorry)

2) Shimmy steering wheel when i step on brake. I know its a suspension problem. I just have not had the time to go to the dealer with a friend of mine to fix it.

Other than that i wouldnt change my X5 for anything... well maybe a Ferrari?