I use these and they work very well. With my set up, they fly the same as field points and I have shot them to 70+ yards when preparing for an elk trip. I have killed several deer with them and had great penetration with excellent blood. I attribute the success that I have had with them because of their accuracy, sharpness and all of the practice that I put in with my bow. All shots so far have been in the vitals with lots of blood (due to pass through) and short blood trails (often I watched the deer drop). Shot placement is key no matter what broadhead you shoot.
I like the fact that they are solidly put together and have replacement blades available. These heads are also easily sharpened.