They work fine for yotes. It started as an I'll show you moment (a fella told me a 1 1/2 size trap wouldn't catch yotes), but I used them for a few seasons elusively and have taken several hundred yotes in the little traps. I now run a larger trap most of the time, but still use the 450s on jobs that the rancher is worried about fido or if trapping in or near town. Not that a larger trap is harder on nontargets, but the little 450s have a better appearance for PR purposes.
This is my youngest with his first yote, in one of my old 450s. The little traps are more kid friendly than a lot of other traps too.