2010-2011 are essentially the same bike, bar the front fender and headlight. 2011 came with e-start. Smaller lighter, more nimble, trials like ergos.
2012 - I'd avoid. Transition year. Plastic subframe.
2013-2017 - Some variations in fork and shock combos. Some 2013 models had e-start (others kick only). Marzocchi PFP forks are nice but prone to anodizing wear internally. Ergos are longer and more stable. Much flatter. Different feel to the earlier bikes, but not bad.
Engine wise, minor revisions to the cyl porting. Powervalve preload adj was introduced somewhere around 15 I think. 14 had the revised ring gear and flywheel.
I'd personally try and choose which platform you like best, and then look for the best deal at your price point.
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