Thanks for the nice comments. I use ats-34 or 154cm mainly. That knife is 154cm. Several years ago when i was making lots of fixed blades ats got pretty dirty inside. Thats when i started useing a lot of 154cm. I think that problem has worked its self-out. Both materials respond the same for me with the heat treat, draw, cryo cycle and the rockwell. Without getting a pissing match started its the best steel around. The grind, Heat-treat and CRYO have more to do with it than anything else. Brett also uses ats and 154 with the same results. We both have used a lot of d2. D2 is great steel however theyre is a variation from different supply houses. Some of it is made overseas some in the us.It does respond better to cryo than any steel i have ever tested. Its Great stuff.