I'm running the freeride version 11-36t (I need to ride to some of the trailheads and I don't race).
Before this I was running a 2011 X9 which was good when it was new, but was skipping and needed replacing.
My initial thoughts on the zee are that it's tight and quiet as advertized.
I recently purchased a 888CR and a firm spring to go with it.
The extra spring didn't come wrapped so I wrapped it with transparant shrinkwrap used for battery packs.
It fit's just fine.
I might be mistaken, but I believe the main reason for the wrapping is to elminate any rattling from the spring.