Faster lock time means that there will be less time between you pulling the trigger (actually, tripping the sear) and the round actually firing, because the hammer strikes the primer faster.  In a match situation, this can help the shooter shoot more accurately because it gives less time for the shooter to move the gun off-target before the bullet leaves the barrel.

This may give an already-expert shooter an extra bit of edge, but it has NO PLACE on a duty weapon.  Many people with these hammers have had problem with light primer strikes and failed ignition, particularly (as you would expect) with military loads that use less sensitive primers.

Unless your rifle is on a solid bench on a nice rest, supported at both ends, you're controlling your breathing, and so on, you'd never get any positive benefit from this.  In a defensive/duty/tactical situation, you're shooting offhand, probably after moving (maybe even running), and certainly with your blood pumping.  How is faster lock time going to make a difference anyway?

-Troy