There was a major frame revision done starting from 2012, identifiable by looking at the seat (it is split into two) and the later ones were a bit lighter and had far less vibration through the bars. I had a 2012 faired model which I owned for 8 years. Great bike - very easy on fuel (65-70mpg), comfortable, fast (130mph) and with loads of torque. Never had a spot of trouble with it and only sold it as I wanted a change. No issues with any cracking. Before selling (and getting a ZZR600), I did try a 2019 model (then called Ninja 650). Bars were a bit lower and it was 20kg lighter which made it felt even more lively but by then I had decided to change to a 4-pot. They're quite basic, no-frills machines but I had 8 years of fun (and 2 trips to the Isle of Man) on mine