Both the XM and CB modules were compatible when I swapped the BOOM GTS for the GT ON MY 2017 CVO Limited. I did the install myself. Directions are quite easy. Then had dealer do the flash to mate the radio to the bike vin.
That's encouraging. I ordered the Boom GTS last night and am anxious to complete the install.
Was on the fence and considering upgrading to a 2021 CVO Road Glide due to the new GTS, TPMS and Stability control system. Went to look at a Black & Orange fade yesterday and realized that after having three Road Glides with the last two being CVO Ultras I wouldn't be satisfied with it as is. Would be looking at adding a tour pack, windshield, full size mirrors, full engine guard and saddlebag guards and still not up to Ultra level. So between the asking price and upgrades and the full court press by the sales staff which turned me off, I decided to walk. Upgrading my OE Boom GT will make me happy and I'll be about $30K ahead of the game.
Maybe revisit if HD decides to release a CVO RG Ultra in the future.