You don't need a gyro unless the plane is almost uncontrolable. Our club "jet jock" has gyros for yaw stability on his. One of his would spin out every time he flew it if it werent for that gyro. Unless the plane actually needs it, dont use it. It's a crutch. If you use it, you'll eventually have to learn to do without it, so why make yourself have to learn again? It's your call though, thats just my opinion.