I purchased one year ago and it has roughly 1000 mi on it. Very good cosmetic condition (refer to photos) - I have the bottom of the chainstays and the downtube taped with 3M helicopter tape to prevent nicks from road debris. There is one paint chip in the right chain stay - cosmetic only - that I keep wrapped with electrical tape to prevent it from spreading. 

Overall just a great and comfortable bike. Can be a road bike or a gravel bike since it allows clearance up to 38mm officially (but some people even go bigger). Great for long days in the saddle as well as fast group rides. Once you go Di2 you'll never go back!

Asking $3500 OBO. If you buy this new from Trek you're looking at almost $5,100 after tax so this is a screaming deal.