I worked for over 3 hours using my sharpmaker diamond stone and was not even close on my RMD and that was at 40 degrees. I gave up and put it away for awhile. Decided to break out my Edge Pro and was able to get it down to a reasonable edge in less than an hour. Now it is a great knife to use and it stays sharp through a lot of abuse. Stick with the reprofile and you will realize how good the steel is. It is too bad that the edge is so obtuse from the factory. I don't think the original designer meant for anything close to a 40 degree edge on these knives.