I have a 75S with the forward lean, and find it #1 comfortable at speed, #2 controllable in the twisties, #3 requires good core strength for long days, which requires more sit-ups and fewer PBRs. If you watch all of the best riders from Mad Max, Tron, etc. they are all in a sporting position. There are exceptions like 007 (the CL sucked), and Electra Glide in Blue, where he got shot in the end...also sucked.
Seriously, I've never owned a begging dog bike. They may create huge guns, and look cool, but not a distance style I'd like.