What should I say? This is a strong frame design that keeps the mass closer to the center of gravity by lowering the top deck where the battery sits. I love the fact that there are 20x20mm and 30x30mm holes, but I love the fact that there are two of them even more! The true X design provides a more consistent spin and spin rate and ultra-stable flight performance. Overall, this is a solid frame that flies very smoothly. My biggest complaint is that the bolt nuts should already be pressed in carbon, but they aren't. Also, the 14mm screws for mounting the flight controller are too short, they should be 16mm or 18mm. In addition, it is a strong, durable frame that offers excellent value for money.