Gyro's have been around for years, they used to be called "Drift Boxes" and I think HPI was one of the first brands to market them. I also believe KO Propo was the first surface based radio system to integrate them with the transmitter to be able to adjust the gain control from the radio, and then other brands slowly caught onto this concept. One of the least expensive brands with an integrated gyro is Radiolink who now charges the same price for the entire radio system at roughly $50 where HPI charged $50 for just the stand alone drift box without any integration, ha!