From a strictly flying stand point. The 30% alows me to swing more prop and still get a fast spool up. I fly 3-D with mine. A 13x4W apc is great with 15%. Switch to a APC14x4W and the spool up from a hover is terrible. The difference in top end RPM isn't much from 15% to 30%. The difference in throttle response is night and day.


David