I agree - The PM2, boy, I love the PM2!!, was my introduction to S45VN steel, super steel as a whole, in fact - the reason, I thought, why the switch was made to S45VN is because it tended to roll more than chip. Not just by Spyderco, but by Chris Reeve, too? I have heard S30V has a near unnoticeable higher edge retention.
Wouldn't S45 make more sense on a longer blade, especially? I would rather it roll, too, with how close it is to S30V in retention. I wonder why they would make that switch... just for the PM2 and the Pochi, if I'm thinking correctly.
On the other hand, I trust Spyderco.