They are good designs, and I have 1 in M2. The thumb rest serrations are too aggressive for my liking + they hinder the sheath lock from fully locking, so I grinded them lower and flatter. Now my thumb are not as sore and the blade locks properly in the sheath. Go slow and always test that the lock is secure, when grinding the serrations, you might overcook and find that the lock is too loose. The blades on the M2 series is thin so its a good cutter but NEVER pry with it. Overall, I like it.