Just to bump up this thread I collected some posts of the xray forum about the plastic/alu diff mess
TonyV (teamdriver) wrote on Wed Oct 31, 2007 7:01 am
... when the first production kits were provided to the team drivers in Vegas some of the parts were not yet available in sufficient volumes for everyone. Notably the new diffs without the blades.
Announcement on the xray site on Nov. 28, 2007
Exclusive First batch
Please note that the mold for the new Composite Diffs was not finalized for mass production in time for the export of kits, and as such the first batch of kits feature aluminum externally-adjustable ball differentials. ...
Mario wrote on Sat Dec 01, 2007 2:33 pm
The XRAY composite diffs have been long term tested by factory team drivers around the world in all the different racing conditions and as such you can be sure that what will get into final production and into handso f racers will be the usual XRAY premium luxury quality. That is all what I can say on this - it is XRAY.
I don't know about you but I'm confused now... As far as I know the factory drivers did not have access to the composite diffs at the two big races where xray introduced the car (European Championship, Vegas) so I assume they could not test those.
Of course the mess also proves again that you can't please everybody, some wants the plastic diff some thinks it won't be as good as the alu one... the xray forum became an interesting reading lately...