Geoff Green

I have a 2008 X358 and need at least one rear air suspension unit (leaking) Has anyone experienced the lower cost replacements ie less than the BIlsteins? I assume that they are all made in the same Chinese sweat-shop but at wildly varying prices. Are they any good and how long do they last? Plus, my manual says that Jaguar software is to be used to set them up after replacement. Is there a way around that? Thanks Geoff