Faster. I got mine because it's faster than my DF. I love the fact that the increased aero produces such a noticeable result. I had a terrible time trying to break 50 mph on my DF, now I do that regularly.
All the other stuff mentioned are pleasant side benefits (which I very much appreciate).
Another benefit that I didn't see mentioned and one that wasn't a reason for me to get a bent - but still pretty cool >> Applause. In all my years of riding DFs, I never once had anyone look up, see me coming down the road, stand up & start clapping for me. I've been riding my bent for a little over one year & this has happened multiple times (& no, I'm not even including all the "Cool", "That's great", "Wow", etc comments that regularly come my way).
... and yes, I do wish I had gotten one years ago. Although I've always enjoyed riding my DF(s), once I started riding my Musashi, I felt I was made for this...