buying a 2015 switchback pro S 800 (any quirks to speak of?)

hi Fellas, me & my buddy are upgrading from our Polaris xc 800s. hopefully if we can find 2015 pro S 800s with low miles. I imagine this will be an awesome change, its like going from riding an unruly overweight donkey through a mountain trail to flying first class on a smooth jet! I've read all reviews I could find, can any of you educate me on any common issues with the new axys chassis or electric oil pump or anything else that's new on the axys in 2015-2016. id love to order a 2016 with the cobra track option but id also like to save 3k & get a 2015 with 400-500 miles. if I understand correctly the 2015 & 2016 are exact same sled...would appreciate any feedback, thanks guys. (I found 2 of the 2015 sleds with under 550 miles each (demo sleds) but I will have to get them shipped from the Midwest to Massachusetts. oh also one other question...I always had picked tracks, is it not typical to pick the track on a pro S 800? ok thanks again guys, I appreciate yer feedback

buying a 2015 switchback pro S 800 (any quirks to speak of?)