I did the swap from stock gunfighter (07, 4k miles) to slightly earlier (05, 12k miles, I think) solo. Not sure if the years make a difference but...
My thoughts: the solo tapers more from front to back and is slightly firmer all over. This gives slightly more control of th bike as I can grip the tank better.
Overall comfort advantage goes to the gunslinger, however. Its wider front end gives a bit more support to the thighs.
I'm quite happy to sacrifice a bit of comfort for the control, plus, I get a lot more comments with the solo on; it completely transforms the look of the bike.
Hope this helps.
