If you can get a 9-10 on a PATTERN 4 point with a 1/5th scale AT-6 you are pretty good pilot. They do WARBIRD 4-points pretty well, but a true straight, on a string 4 point is not their forte. I have flown one quite a bit. They do not necessarily transition from one point to the next smoothly while maintaing a constant altitude. Throw in biut of an arc, and they are great!