effle18,
I am in no way promoting the company where I bought the bars, but there are better pictures of my bike at
http://www.wild1inc.com/571cm.html
I personally like the looks of dog bones myself, but when I looked into it, dog bones were not an option because the 6" looked like they would hit the dash if the "joint" was facing the dash. It may work if they are facing away but I don't know how good it would look.
As long as you use a 1" diameter bar you will not have to change the top part of the tree. The risers on a springer are 5 inches apart whereas other HD's are 3 1/2 inches apart. If you buy the fatter bars (1 1/4 diameter) you will have to buy the adapter from Arlen Ness to convert the top part of the tree so it moves the riser in to 3 1/2 inches. if you use 1 inch bars the knurls that are cut into the bars will not match up with the risers and it will be harder to keep the bars from slipping. On the 16" bars that I had prior to the 20"'s I placed a small piece of sand paper between the bar and riser to reduce the slipping.
Of course you will need all new cables, brake lines and extend the wiring harness.
As far as comfort, I love it. I rode from the mountains of NC to Myrtle Beach with no problems.
Regards