I have them and like them a lot. You can also move the baffle forward and rearward to change the tone. It takes some drilling and riveting but does work.
I have been told by another 1800 rider who was following that under a load they sounded like a small block chevy.
If there is a negative, it would be that after about eight hours in the saddle, you might want to hear less of them. They really aren't loud though. I call them mellow.
I have, in the past, described them as sounding like a porsche.