Here's what I posted on Rimfire Central,
The 452 has a single stage trigger that has a small amount of trigger pull weight adjustment. There is no change in trigger location/length of pull when it is adjusted. Generally speaking, the 452 trigger will have a very noticable amount of creep in them for most folks. Some folks will pull in such a way that it is not noticable by them or are comfortable with the creep and are able to use it to help them gage the release point of the sear and some triggers will have a very minimal amount of creep due to manufacturing variations. Generally, though, the creep is long and gritty.
The 453 has a set trigger. Whereas the 452 trigger is directly in contact with the sear, the 453's trigger has a couple components between it and the sear. The 453 trigger can release the sear without setting the trigger, working like a regular single stage trigger (feels like the 452 trigger). In this position, the trigger butts up against a lever that contacts the sear and acts as one piece with it when pulled, The trigger actually has more adjustment than the 452 trigger. It can be adjusted for sear engagement (which can remove or add creep), pull weight, and overtravel. In this respect alone, it is better than the stock 452 trigger.
In the set position, the 453 trigger is pushed forward to engage a sort of 2nd 'sear' for the trigger itself which will now act as a 'hammer'. The trigger is spring loaded and when pushed forward compresses the spring and the 2nd 'sear' holds it in the forward position. Releasing the trigger in this position is a simple matter of just pulling the trigger. The amount of spring pressure is also adjustable for pull weight in this position. The 2nd 'sear' engagement in this position is very small and has essentially no perceivable creep. When the trigger is pulled, it springs the trigger rearward. As the bottom of the trigger springs back, the top of the trigger (above the trigger hinge point) springs forward. The top of the trigger hits the lever mentioned above that the trigger butts up against in the un-set position, acting much like a 'hammer' on the lever. When it hits the lever, it in turn releases the real sear. All of this, of course, happens so quickly the shooter doesn't notice anything different when shooting the gun un-set with one exception.
The exception is that when the trigger is pushed forward, the distance is relatively long and noticably increases the trigger length of pull. Compared to my other bolt guns, it is not as comfortable when in the set position but livable. Also, remembering to set the trigger is a bit of a small hassle.
To continue, the CZ guns will outshoot the 10/22 out of the box. However, the 10/22 can be rebuilt to outshoot the CZ but it will take much time and money to do so. (My sample population for the claims is 7 CZ 452/453s and 10 10/22s - 2 additional 10/22 yet unfired but would guess they shoot the same.)