Unless I'm mistaken QC's HL kit is essentially a stock cinestar frame with upgraded electronics and motors. Freefly has not released any improvements to their original frame platform. What I have done to strengthen my CS8 kit is to use metal clamps on all 16 spots on the center hub for the booms and I also use one pair of metal clamps for the motors on the outter slot. I noticed a big improvement in the center hubs sturdiness. YOu can get metal clamps from China pretty cheap. I also modified my frame to run 2 seperate battery plates that mount to the booms which lowers the center of gravity and brings it back to the center hub which is a huge improvement for anyone that wants to run the real big 10,000 QC lipo batteries.