wow – that drop bar one looks pretty good.
I have one, with 100mm Rebas – a very nice XC bike.
Mine has a Bob Jackson paintjob so different color and no easy chipping.
My dropouts have never slid, I think there is a fix where you can put some bolts on the adjusting screws to stop it sliding anyway.
Never lost my chain from flex in the back end – but then I spin the pedals a lot and never mash them.
The back end is not as good as my old Kona Explosif (OX tubing) at keeping composed through rough stuff.
The headtube is also quite tall on it.
For XC the angles are great. Joe Murray design.
Lots of very good reviews here, a high score for mtbr.com:
http://www.mtbr.com/cat/bikes/xc-hardtail/voodoo/wanga/prd_365008_1527crx.aspx