the radian is a sleeper, i have flown competition for years and was a skeptic, took it out with other experienced fliers and smoked them, no fluke.. just bought the radian pro its excellent as well doesn't climb as steeply as the standard radian, i think its the prop, so i am going to switch it and try it i assembled mine at the field... i may try a 4s battery to boost the climb on the radian pro, the esc is programmable