I have the se254e cams and love them! I have a cousin who has the 255's in his street glide and I always pull away slightly in a race. I'm not the better rider and our bikes are set up the same, the 255's just fall on their face in power early in rpms where the 254e cam's lets you build power too redline. The 254e cam's also don't destroy fuel mileage like the 255 torque monsters do. Riding both bikes they feel similar, the 255 does have a lil more low end grunt but the power quicly fades as the rpm's build, where the 254e cam just feels like a stock motor with just more power everywhere in the rpm band. There are much better choices for a cam for our bikes, but if staying with HD look at the 254e cam.
2012 Road Glide Custom Vivid Black named "Becky" with a simple motto "If it came from the factory like that, it doesn't belong on the bike!"