Hi, just came across this post and would like to disagree with some of the comments. I've installed the Exxtreme core upgrades (all of them) onto my CX3 and it flys incredibly well. Prior to installing the upgrades, I had major TBE and was ready to scrap the copter. Like others, I've taken Sonny's advice and scrapped all of my CNC parts, though I do prefer the CNC swash plate as it has less flex.

For flyers having issues with this system, i'd like to share two things that i've learned. 1. The blade grips need to be very snug for stable flight, and the grips need to have even tension. 2. Make sure that the flybar linkages are even. This is more difficult with two flybars, so what I did was fit one linkage, then remove it...screw it closed and count the turns. Then I matched the 2nd linkage to the first and it flew perfectly. 3. Make sure that the mold seam is not prohibiting the movement of the linkages. You can get a piece of 600 grit sand paper and very gently smooth them out. 3. Measure the weights on the flybar to make certain that they are even!! This is very important and you should measure from the center pivot to the inside or outside of the weight. Even a small difference will effect flight. The further out that you place the weights will provide the most stability, and the closer you place them will increase performance. I've been switched to Flyrcivsud's new graphite flybar and flight is very stable.

Good luck and contact me if you need help. Sonny is an excellent resource and has been very responsive via the phone and online. He even had me send photographs and provide guidance, so I would suggest giving these guy's a chance if you're considering hop up's to your CX copters.