I have a Zumo 550 that works just fine. I'm thinking of transitioning from a Baehr Ultima XL (wired) headset system to a Sena 20S (BT) headset, mainly so I can communicate B2B with the guys I usually ride with (and also receive cell phone calls while on longer trips). (They have Senas.) I'm wondering if my mp3 tunes stored on my Zumo 550 will transmit via BT to a Sena headset . Does anyone have this setup (Zumo 550 with a BT headset) and can you advise me as to it's workability? Problems encountered? Like it? TIA.