I was surprised to see any negative comments about these heads. I bought some Concordes for my twelve yr old, with his short, 40lb draw. They are long, and narrow. He gets great penetration with them, and his arrows fly perfectly.
To get them sharp, I used a file to get the angle close,
then a clamp made by GATCO.(Similar to a Lansky)
The stones on the GATCO are wider than the Lansky.
This gets them scary. The steel was medium, and takes plenty durable edge. The final edge is 22
degrees. I have no doubt these will be good medicine for our local whitetails.