Pretty good and sturdy frame. Have to fly more to see how durable they are. I use Caddx Vista Nebula Pro and Emax 1404 motors with 4S 525mAh. It flies pretty well even with the default PID BF 4.2.8 (with D min disabled) with no jellies or vibrations judging by the black box logs. I just made a few minor changes to the PID and disabled D min to avoid throttle wobble at low speeds, which is a known issue in BF 4.2. Cheaper than buying from BG and faster shipping with Revain Prime. The side plates are visible at the top corners when you have a higher camera angle, and the center protrusion can get in the way of your PC's USB port. I'm using JHE FC and it fits snugly in the USB port.