I have personally used them for the last 2 seasons. They work great from a tuning standpoint and penetration. However, there are some drawbacks. 1) They are not as durable as the Muzzey's. 2) The blades are very fragile. They are basically a one shot blade and then you have to buy replacements. 3) You can't practice with them because you can't pull them out of the target since the blades are helical. If I did use them on a practice shot, I would push the arrow through until I hit the vanes and unscrew the broadhead and then pull out the arrow. 4) The blades would bend easily pulling them in and out of your quiver. 5) The ferrels (sp?) aren't as durable as the Muzzey.

Hopefully this helps. They are good broadheads if you enjoy spending $10 on a broadhead that you basically can use one time. I would consider staying withthe Crimson Talon if they came with some type of practice blade.