Looked at the Scala links provided, and have a couple of remaining questions not addressed by the sites.
1) What kind of battery life is "typical" when streaming music, GPS and using as intercom? I sometimes ride 14-16 hours in a day and do not want to lose these feeds when battery pukes.
Answer - Scala Rider lasts about 7-13 hours depending on the model (from their Website). Sena 8-12 hours depending on the model (from their website. From personal experience recently I rode with the Sena streaming music / intercom active for about 12 hours, and it was still transmitting at the end.
2) Is battery replaceable en route (after stopping, of course)? Same reason as #1, above. I could take along extra batteries and a charger, making sure I can charge an extra one or two per unit to get through the whole day.
Answer - ScalaRider & Sena No batteries are sealed. However Sena has the ability to recharge on the go, ScalaRider does not.
3) Are the batteries standard sizes (AA, AAA, AAAA, or similar) that I could also use disposable piles if not wanting to dink around with recharging?
Answer - N/A see point 2
Yeah, yeah, yeah, I know three questions is not a couple. So what?