I've seen the short clips they use to advertise them. I'm sure you have as well. There are 100 ways to shoot a bow without sights, and it looks like they cover most of them. I can't see how it could be a bad investment. Years ago, I shot competitively and saw people shoot fairly well with most every method... the exception being hunched over, knees bent, sling it and shoot it method. It's a fairly popular way for folks to shoot, but I have never seen anyone drive nails doing it.