I've used gyros in my 3D birds. I only use it on the rudder, but others use them on the rudder and elevator. It helps somewhat in a hover by keeping the plane in what ever position it was in when the last command was given. On the ground, it helps keep the aircraft straight on takeoff (that helps since all of my 3d planes have 0 degree engine thrust). In the air it's supposed to help with maneuvers like knofe edges, hovers, harriers etc. The biggest drawback that I've seen is adjusting the sensitivity. They tend to make difficult maneuvers seem a bit easier, but if you're just flying around the house, you have to keep one step ahead. (unless you can turn the gyro off from the TX) Say for instance you have a gyro on the rudder and you go into a turn with the nose a bit low. Without any input to the rudder, the gyro is going to try to correct the heading to bring the nose back up. If you're a "Yank and Bank" kind of guy like me, it can get hairy real fast, especially in something with a huge rudder like a U Can Do.