I don't know, but I get a kick out of my ParkZone Butch O'Hara's F4F Wildcat with safe. I'm an intermediate flyer, and sometimes it's just fun to have a plane I go out to the field and throw it and it stays level on its own and also on landing. I usually switch it off when I'm just flying it around because with "Safe" it is just too limiting. Also I was once out with it on a pretty breezy day and kind of lost it, then just switched the Safe on, she leveled out and I (she) was fine. So I wouldn't want to be stuck on the "Safe" mode for most of the flight, but it is fun to have it. She pretty much basically lands by herself.