I have been wanting to get my hands on a Red Icon, and finally getting there where I can get one. I'm considering either buying a brand new 2017 or getting a used 2015 with 1200 miles for around $6200. Is there any big differences between the 2015 and 2017 models? I do like the cheaper option, but I want to have this bike for a while so I would like to get the best option overall. Any information would be greatly appreciated!