A3's are great gyros. I've used them on both edf's and turbines. The A3 II are even better since they will take SBus single line input and with my Jeti, I can have a really clean install on my smaller edfs. I replaced one with a Igyro SRS and flight wise, I really couldn't justify the cost increase but I felt the setup procedure of the igyro gave you better settings. Currently I use A3, A3 II, Igyro SRS and an Igyro Mercury ( all for different reasons). Also, a friend of mine has been flying a3's down at Georgia Jets and now more members are installing them. In my opinion it's probably one of the best gyros for the money.