My mech is awesome and tells me all the time that the e53 is worst designed X5 to date. All successors have learned to be better designs (not necessarily more reliable (ahem, turbos), but better handling, faster, convenient for driver...)

__________________
I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

_______________________
'91 850i
'05 X5 4.4i
'09 Clubman S