Hi
I too have been looking at them for a project. As regards telemetry, it would be nice if the Futaba ESC logged and transmitted total amps drawn. That way you could set the telemetry to allert you when you are getting close to a selected limit. It would be alot better than monitoring pack voltage which could then be used as an alternative means of health check.

eg the telemetry squawks once you have pulled XmAh or the voltage drops below Y volts.