Welcome to the forum! Usual tips of look to see if it's been raced i.e. Scruffy frame but fairing looks good, had recalls done etc, have a look at auto trader and eBay to see what prices they are going for! Don't over spend on one because you like it as another will come up
No problems with my 09. My tip would be buy on condition...loads of out there to choose from, so buy the nicest you can afford. I've sent you a private message