I recently read that the main difference is that the 2015 is NO longer built with the Reynolds 520 steel. They are now using a more generic chrom-moly 4130 (not sure of the number). To me this is a game changer, as the 520 frame IS worth the price of admission alone! You can always upgrade/change components.

I just bought a 2014 from someone who had not ridden it much & needed $$$ more than bike. What a sweet ride. I'd look at Craigslist and/or, call around to shops to find one (good luck with that!)