Just mentioned this in another thread but my experience with them in a cross wind with 100 thunderheads was not good. The 4" vanes I shot them with was better. I didn't spend a great deal of time on it though but did do it with the wind going in different directions on 2 occasions and the results were the same @ a distance of between 35-40 yrds. I do plan on trying the test again with some other vanes as well. Bought 30, 100 thunderheads last year for 50 bucks so those aren't going anywhere.Other heads may give better results.