Yes, stabilization systems are increasingly common among the so called "ultra micro" models.
I just bought a E-Flite Radian UMX, which is a stabilized and miniaturized (29" wingspan) version of a larger model (the 2M wingspan Parkzone Radian). The stabilization makes it much easier for inexperienced users to fly in gusty conditions. Like the OP's home-built system, it has a rate-sensing gyro system that compensates for any uncommanded movement. The plane flies perfectly straight regardless of wind and updrafts unless you give rudder or elevator inputs.
I just bought a E-Flite Radian UMX, which is a stabilized and miniaturized (29" wingspan) version of a larger model (the 2M wingspan Parkzone Radian). The stabilization makes it much easier for inexperienced users to fly in gusty conditions. Like the OP's home-built system, it has a rate-sensing gyro system that compensates for any uncommanded movement. The plane flies perfectly straight regardless of wind and updrafts unless you give rudder or elevator inputs.
I am still amazed it was only $80.