I have a2009x5 on H&R 1 1/2 stock bump stops. and links in the back.
I just replaced the rear airbags.
The only thing I don't like about being lowered is that when you happen to hit a good size bump it bottoms out and it is loud, some times I wonder if I bent or broke something, I do get the alignment checked regularly. Otherwise I like the x5 lowered . I'm going to look into replacing the bump stops in the front .