I ride with a friend that has an 865 America. He freaks how quick my 790 is. He cannot keep up with me off the line and we have tried it a few times. Other than TORS and 19 tooth front gear I am stock.
You know there is not one thing I can say about these bikes that makes it outstanding or better than others. It is the most average bike I have ever owned.
It is also a joy to roll away the miles on. It is not the individual specs. It is the sum total of the bike.
I also agree with Newt. I have been racking up miles on my new Rocket and love it, but I climbed on the America the other day and god did it feel nice.
My dad had a 1958 T110 Tiger which was 650cc and considered the biggest bike on the road at the time.