The QAV500 was my first successful attempt at multicopters and I used the naza flight controller. After watching tons of Juz videos on youtube, I finally went ahead and got a CC3D to fly. It sat on my nerd bench for months while I was out flying the phantom in fpv - couldn't beat the simplicity of that! Now that I have the Z3-2D on my phantom, it flies like a lead slug so I needed something for when I want to speed up and fly more aggressively -- this certainly works well! No more stuttering when I want to drop altitude fast, it just falls evenly. I went ahead and linked the unedited video, just turn down the volume and watch how well this thing flies around!