I rode a friends 1100s with the sprockets, otherwise it was same bike as mine.
I did like the punch right off idle, but for me and my style of riding, I prefer the stock cam setup.
When I'm in the mountain twisties (thats pretty much everywhere in my area), I like to keep the engine singing about 4-5k rpms, ready to jump up to the limit, and also with plenty of engine braking available. With the sprockets, the bike felt out of breath up top......
Yes, I get crap mileage when I'm out having fun (keeping revs up), but 35mpg is still almost twice what my Bimmer 545 gets (having fun).
Sprockets are good, they do just as advertised. Just not what I am looking for!