I've put almost 15k on my 2010 with no issues..  Just shy of 5k, mostly track miles on my 12.   I have read a handful of stories of engines going south, mostly older 10s.   All bias opinions aside.. It's an amazing bike and haven't ridden a bike that compares to it.  The abs/traction control is smoother in the 12s and up.  As well the suspension changes alone are worth getting a 12 or newer.