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.