Advice on buying a polaris switchback

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've read all reviews I could find, can any of you educate me on any common issues with the new axys chassis / electric oil pump or anything else that's on the axys 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...I always had picked tracks, is it not typical to pick the track on a pro S 800? thanks again guys, I appreciate yer feedback

Duke

Advice on buying a polaris switchback