I just built an X8 with Super X. It's my first coaxial, so not much to compare it to, but it's worked okay. I've got about twenty flights with it so far. The GPS works great and the return home works great, but I haven't been able to get it to fly as smooth as the Hoverfly, but with the cost of these things and cameras I'm really feeling the need for a reliable "return home" and failsafe RH. I'm still getting used to the throttle, but think in the end I'll like the center stick to hold height concept. It sure is easier to land smoothly. Be sure to get the calibrations done correctly. It's a little tricky for the first few times. Also be sure to calibrate your escs for your throttle throw. Have fun!