They are ugly. They are unnecessarily right- and left-handed, so if you get them mixed up you have to look at them carefully to see which is which, not that it matters, kinda like determining the sex of a gnat. They did not work in most of the locations I put them on my airplane . Some locations seem to work, but it may just be my imagination. If they do work, the effect is subtle. Don't fall for that "designed by an aeronautical engineer" stuff. I think he "designed" them by looking out the window of an airliner at the wing. They are fashionable, though, and all the top fliers have them. They are made on a 3D printer, and you can't get more fashionable than that these days. Rush will have them at the Nats, so bring money.