I don't have extended storage on mine and I did consider it and then regretted not ordering it for a while but, as Bimmer UK 76 pointed out (link), the nets just end up with permanent junk in them and look untidy. And do you really need the other bits? I might get the shopping hooks for the boot as a separate accessory but couldn't see any use for the other stuff. Had the car two months and no regrets for not ordering
http://x3.xbimmers.com/forums/showthread.php?t=491486