RE: 3 axis Gyro
On the plane i have a gyro installed it's only for the rudder and that has helped tremendously..
On my other planes i don't have a gyro and can hover with no problem and do any manuver as long as the wind is less than 15mph and no gusts. [aka fly either at 7am or nightime] With gusts of 20 mph i still try and can succesfully maintain a hover but i can only maintain it for 2 min before i have to get out of it because i'm sticking my thumbs too much into the sticks.
I'm thinking of putting it on first my test plane to see if it helps when the wind is gusting so strong that a lil help will be welcome [hovering and getting slammed with a 20mph gust ain't fun]].. If it doesn't work well then tot he trashbin they would go.. i have no problem with wind conditions for any manuver as long as it's anot a hover.. heck i prefer extremely windy conditions for that.. cause when there's no wind my figures are even more precise.