I use the earbud baseplate with custom earplugs which are very effective at blocking outside noise. This creates a problem when I attempt to communicate with non-Sena users (gas/toll attendents, other motorcyclists, police, etc). I usually have to remove my helmet to understand what anyone is saying to me.
It would be nice if I could turn on/off sidetone as desired, perhaps was a simple sequence of button pushes or by saying a phrase like "sidetone on / off".