I've been though a couple SMH10 Senas and have 10S currently after i left the power charging port open in a rainstorm on the last one. I unlatched one and it was run over by a car behind me yet still worked other than the rotor button.
Sena's have all been good for me, reliable, run's all day and people can hear you clearly. Range is plenty for my needs. I also use a SM10 for connecting non bluetooth devices (used to use it for radar detector).
I typically ride with 2-3 other and the SMH-10 connects to everyone in a group fine so long as you pair them correctly per the directions.
The SMH-10 is pretty reasonable and works well, no need to get anything more honestly.