I have done several. Did 2010 Limited stock cams, a 2012 Limited with TW555's, and 2010 Triglide with tman 555C cams and true duals. It needed some help for sure. The 12 with cams made way more difference in the performance as it needed a little help down low and in 6th at 65 or so. Biggest thing I noticed was not having to shift nearly as much. You can easily run 5th at 35 in town if you like. 6th will go down to 45 MPH no jump or jerk on either bike. Used the Falcon belt first then about year it started breaking and stretching and went to the Gates 139 tooth by 1 inch wide. Stock is 140 tooth. We used the front pulley for 11 up Triglide. The 10 Triglide had 32 tooth.
If I decide to do it again will definitely look into the 49 tooth clutch sprocket kit. It is little more expensive, but is many times easier and the end results is exactly the same.