Mesh operation: You are right. If the person power's off his SENA and turn it back on and forget to go back in Mesh, he won't hear anybody. On a sidenote, I sent many bugs to SENA and some have already been adressed so I suspect they will also fine tune the unit with this option because it sucks to always have to go back in the mode you want ("I" want to be 100% of the time in mesh, why are you always sending me back to bluetooth when I power off my unit!). More and more people/group are using mesh only so leave people in the mode they selected prior to power-off please. An alternative, if you are paired in bluetooth with him/her you could call him but if you are on open mesh and he doesn't turn it back on (after a break, a lunch, a visit, whatever), he's out of the loop... Battery life: I have now more than 5,000km on the 50R and have done many battery tests... In mesh, in my original review, I got ~5h30 with just mesh and music talking to nobody and a bit shy of that when in mesh mode and talking so without having a lot of knowledge in how the mesh protocol is programmed, you seem right that in mesh, talking or not doesn't make a difference. SENA lacks the battery life and waterproofness for many but not all and the 50 series have many bugs that has to be sorted out but... What I can say: The SENA mesh needs a bit of fine tuning but is the best around on the market (clarity, reliability, multi-tasking) (I've tested the Uclear Motion (short term), SENA 30k (long term) and Packtalk mesh (long term)..