One reason the cx is louder than the cp is because it has 2 motors instead of one. These things are very stable fliers, i was about to fly it with only my left hand with no cyclic inputs for over 10 seconds. These things almost hover on their on, but even so they are still loads of fun. It's going to be interesting to see what kind of upgrades people are going to do with these things. And they do need to be trimmed when you open the box.