I used the 650' s with the cast, offset jaws when I lived up on the Canadian border where we had some really big coyotes. What I liked about them: with the wire followers and quad springs they would come up through a pretty good, partially frozen dirt cover and still get a high grip on a coyote. I seldom had one where the foot was not still mashed down on the pan. I liked the centered D ring, so the coyote was not able to get an angled pull on the trap. I liked the offset jaws which close further, relative to how high on the jaws the followers could get. In my experience, when a coyote tripped that pan, he was yours.
What I didn't like about them: The inside jaw spread was bigger than the state of NY thought I should be setting on land.
If I were getting started today, I would have no problem going with the same trap in a 5" size if it had all the same characteristics.
You need inside laminations to be legal in NY
