They really help most bows. I've used everything they've ever made. I love the new fangled Sims stuff(leeches). When I bought my Guardian they had some factory installed things. They were good but didn't last. I finally just went back to the old rubber cat whiskers. Pretty hard to beat them. They're indestructable and cheap. They don't cost you much in the speed/energy department. They last forever and anyone can put them on without a press.