I went from a 2013 to a 2015 CVO FLTRUSE. There are several improvements for me.
110 with a new exhaust and tune pulls way harder than my 103 with internal work, cams, exhaust, and tune.
The suspension, and way bike handled was a big improvement stock vs stock over my 2013. Still not as good as it could be, probably going with Ohlins.
The fit, finish, and quality is much improved, but again I moved up to a CVO.
Air management is much better with less buffeting, the vents are a nice improvement.
Wet head is nice, only complaint is where the vents are in the lowers, if you ride with feet on highway pegs the hot air exits right on your ankles, wish moco would have had some way with trap doors to change the location where the hot air exits.
All in all I am very happy with my 2015 Rushmore.