My limited experience with the "shake awake" feature is positive. i have been using the FF3's for years but this year started the season off with a Halosun 407 green dot sight which has the "shake awake" feature. It will not go off on off on while hunting. They come from factory with a default at the 10 minute time frame of inactivity in which it will shut itself off, this can be set for longer durations, and the slightest movement will activate sight and be on. I doubt that most people would be able to hold gun still enough for sight to turn off, it is that sensitive. That being said, I doubt I will give up the simplicity of the FF3's. I also own a Swampfox Justice and Kingslayer along with 5 or 6 FF3's and several Halosuns, green and red dot.
Ridge Rooster