Some very good info posted so far. For me, I have done the Bluetooth connection with my phone. Installed the wire setup from HD on my 15 RG and as stated, it always worked, but after a while I got tired of messing with the wire. Used J&M, good headset and helmet speakers - but just mono with the HD head unit. Decided to bite the bullet and go with the WHIM and the HD wireless headset and do not have any regrets at all.
For me, if I ever get another new/newer bike, I will remove the WHIM and put it on the next bike. If you decide to go with the wired setup, I would suggest taking a look on an auction site and pickup a center console with the opening for the wired headset. HD offers the wire setup to install on a bike that did not have it from the factory. Take that cable and add about 8Ē to it, that way you will be able to run the wire under the tank in the wiring tray under the tank, like it would come from the factory, than up to the console mount.
2018 FLTRXS, Vivid Black, KW Slicer Front Fender, Sundowner Seat/Modified by Mean City Cycle