I have put about 175 flights on my Modelbau Tornado with no gyro and 22 flights on my Ultima-tun equipped with a Demon Cortex gyro. While the Tornado might be considered a trainer or beginner jet the Ultima is easier to fly with the gyro installed. So much so that I will probably spend another 350.00 and put one in the Tornado. I will be installing gyros in any new jets I build. Most pilots flying turbine or edf jets at our field have started using Demons and are very happy with the results.
Steve