I've been looking at the YouTube videos demonstrating various conversions of Syma X8C, G, and/or W quads to brushless motors. Some appear to be pretty successful, a couple marginal, where the pilot has difficulty maintaining altitude control being the common side effect. But none mention how long they are able to keep them airborne compared to with the original or replacement brushed motors, which had a maximum flight time of about 10 minutes. I'm curious, as that is a modification that I would be tempted to try myself, but not if there is no significant increase in performance to justify the cost of parts and labor to do the conversion. Can they run on the original 7.4 lipo batteries, or do they also have to be upgraded to 11v batteries? Presuming the control range to remain the same with the original controller and flight control board, , is there an improvement in manuerability, control, speed, a payload increase?