I had a yz2 which i loved , very good in high grip but could be a bit of a handfull in the damp etc ..
I ran my xb2 for the first time yesturday on a very greasy /damp track ( TORCH ) and even with the kit gear diff it was excellent , had loads of rear end grip and it was nice and easy to drive ..
And the support from rcdisco is second to none