just got a 462 a few days ago . The action is unbelievable. The 452 is awesome as well but the 462 is better . Does the 462 have an extra washer on the titanium side that the bearings ride on that the 452 does not , or maby just the blade shape and weight and orientation of the blade that provides the advantage over the 452 . Haven’t taken them apart but thought I saw where someone said they added a washer on the 462 after customer requests for smoother action ? Believe it came out several yrs after the 452 . Love both knives a lot , but 462 has better action.