I had the Kickers installed prior to picking up the bike as part of the $500 in free accessories. I can not speak to any difference in sound quality. If I had it to do over again, I would have gone with something else and a size bigger but I'm happy enough with it so no big deal. I will say that they are not worth the asking price but since they were "free" and there wasn't really much of anything else I was interested in, I settled for them. I also got the trunk bag which won't see much use but will be nice to have when I do use it. In hind site, I would have gone with the quick detach sissybar setup for those times I don't have the trunk on.