Here at TORIMOTO we have been using SENA products for many years, and they have never let us down. Our first SENA product was the 20S, and we fitted it to many helmets and used it for dirt biking, adventure bike trips, and multi-day sports touring.
We have now progressed to the flagship 50S Sena communicators. These are awesome, with even better voice-control, range, battery life and app support.
TORIMOTO carries both the 50s and the 50r. Both are excellent communicators, the slightly larger 50s offers better battery life, a jog-dial, and the possibility of a boom microphone attachment. The 50r is a slightly more sleek design, but is not easily removable from the helmet, which means the charger needs to be near the helmet.
For ADV and dirt-riding we recommend the 50s. The 50r lower profile, attaching directly to the helmet rather than through the bracket system, and suits touring helmets, but either product offers the same great sound quality, firmware/software & communication range.