I helped a friend setup a Cortex gyro this week. It seemed to work fine, but I don't like the fact that you can not change the gain for any one axis.

Vincent here on RCU has been using the Eagle Tree gyro in his jets with great success. The only thing I know about this gyro is watching his jets. They are very stable.

I have been using the igyro for the last year in a big P-51, it works great. I like the idea that you can setup all the axis's different. I also like flying heading hold on Ailerons at all times.

I have been using the new Futaba gyro gya431 in my Ultra Flash on ailerons for the last 20 flights. It works great. Having three separate gyros gives you many setup options. And if you fly Futaba TX with a gyro menu it allows great options. When I drop my flaps and slow down I can increase my gain.