My CA M24 has a stiff trigger pull, it's fine when you are used to it, doesn't throw the shot off at all (because you have to learn to pull it back the right way), and I see it more as a safety feature than anything. Been times I'd cock it to take a shot, lose that shot cuz they moved, then leave it cocked either until I get to take the shot, or I'm heading back to the staging area, then I just let the BB fly wherever to to render it safe. Heavy trigger pull on it means that no branches will accidentally fire my gun. Also, my M700 (gas) has a nice trigger pull as well, much lighter though, but very smooth.
The Zero trigger is nice though, I'll give it that. And I've shot an upgraded VSR with a Zero trigger, felt odd to fire a sniper rifle made mostly of hollow plastic and much lighter than I'm used to, and I guess my only other
thing is because of the construction and materials, it has a loud SPROING! sound when you shoot it. Because my M24 is all metal and solid composite stock, the spring sound is greatly reduced.