I have experience with three different gyros, of course none of ones you mentioned. My first experience was with an E flight M12 foamy, my first and only foamy so far. I bought the plane to fly at the local boat launch parking lot. I felt like it was always fighting me. It was Spektrim AX3S or something like that, it came preprogramed with the plane. Didn't like it at all.
My second experience is with the Eagletree Guardian. I had one in my quarter scale Cherokee, put it in to play with and found it to be rather nice, the plane flew the same with or without it it was just less work with it on. Sometimes I would just to to land using throttle only, get the plane lined up and ease it in by controlling the throttle only. You need a laptop to tune it. After flying in the NASA Fall Classic with 7MPH cross wind on three days I decided to put one in the Champ. The company is gone so I had to find the program online off another user. I only put a half dozen flights on it after the install. Below are two telemetry logs before and after the installation, I made the logs the same time length about 13 minutes, the top one was during the contest. I apparently landed midway during the second flight and took off again. Which one looks like less work? I found two Guardian online and purchased those.
My third experience is with a FrSky stabilized receive and the last Cherokee and that didn't go well so I will no use any of those again, just purchased an RB30+ redundancy bus for the Cherokee and the first i did was disable the stabilizer. Do know if all stabilized receiver are the same but in FrSky case the stabilization is rate only, on head holding, at least that's what I read.
Spoke with a very good local flyer here that uses the Barvian Cortex and likes it, he stated he uses 20% gain for what it's worth. When I found he uses one I didn't feel so bad using one either!
I do plan to install a Guardian in this Cherokee build.
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