The Hobbieco gyros do take about 2 - 3 seconds to boot up!! That is when I turn on the radio, the surfaces that are being serviced by the gyro's don't come to life for up to 3 seconds, after that boot up all is normal. I have had the gyros out in 90+ temps and in the cool basement @ 62 and have seen no drifting of center trims, or any effect by those ranges of temps. The less expensive single output gyro seems to have more gain sensitivity that it's dual output brother. Gain sensitivity on both versions is fine for nose wheel and rudders, the $70 dollar one just seems to translate to a more active, deeper through when the gain is dialed up near the Max.
Lee H. DeMary
AMA 36099