I went from a 2008 Road Glide to a 2010 Ultra. I put a bagger brace on the roadie before I even had 400 miles on it because I remembered my old 1984 FLHTC. So, I can't say much about the frame. I will say that the bike tracks straighter than the roadie and it seems peppier. My GF likes the intercom and the radio and I am enjoying wearing the helmet. My bald head stays quite a bit less burned.
All in all I think the money was well spent. HD did a little work on these. The fit and finish is better and the motor seems better. The transmission is geared different. I haven't really checked the ratios, but the seat of the pants says fourth, fifth, and sixth are a little closer. I think the final drive ratio is slightly lower. Maybe the rear tire made some difference. I am a pretty happy owner. Ken