There are some compound shooters that swear by them. Apparently, according to them, it is difficult to get arrows to to fly good at extreme speeds. The fellows I talked to sharpen them exactly as the directions from Hill archery advise and they think they are as deadly as anything they have ever used. The standard Hills can be made shaving sharp, but it takes work. I have done it with a Dremel tool with using a variety of the sharpening Dremel bits. I always started out with a 6 inch file mounted on a handle and leaned on the ferrule on all sides to put a good flat spot on it. Then I used the Dremel. They are not the best choice if you want to use standard sharpening methods to get a shaving edge, but I have killed a number of deer with the standard Hills sharpening them exactly how Hill sharpened his head and was always surprised how effective they were. I make my own single bevels from Hill pieces and parts that we got in a large order some years back, and I find those to be much easier to get really sharp because the bevel angle is much narrower.