I had a 1/2 dozen of those DP Duffers traps that had a trigger that was "pulled" vs. "Pushed". I found I had to bed them very firmly into the side of a bank near a trail, or in the trail itself for them to work well. The trap has to be bedded tightly so that the trigger can be pulled without the entire trap pulling out. For baiting these traps, I used a wad of cotton behind the trigger soaked in fish oil, or, very small pieces of smoked salmon. Coons have those claws on their front paws and they can't tell what is trigger and what is bait so as long as you can get them to hook the trigger with a claw or get a finger or two under the trigger to lift or pull on it, these traps work. Incidentally, they work well on possums, too, baited with same as noted above. One season this model was my top possum taker. First one I caught in one I shook my head in disbelief and chalked it up to one of those "well I can say I caught a possum in that set too, now" but after several more in a short time I could see some potential for this to be a possum trap itself.
The coon cuffs model the trigger must be pushed, much like little conibear triggers. I dig a deeper hole and put the bait in the back of the hole, then slip the coon cuffs into the hole and not much else to it. The coon has to reach in and pushes the triggers on the way in to get goodies. When they feel the triggers, sometimes they just grab the triggers anyway but these are fairly sensitive and fire anyway. I use dark black dye or paint the face of this trap black so it really stands out on a bank near a trail, or again, right in the trail itself. This trap also fits nicely into the end of a 4" PVC pipe, so if you have some 1.5' lengths of pipe around...shove one end in the bank or just out in the water at edge near a trail and lean the pipe toward the trail or have it straight up in air. I cut a notch for the chain a little down the side, and the trap will slip right in the end...a set that has a lot of eye appeal and is a coon killer for me. I run these on drowners, too.
Of the two models, I prefer the coon cuffs due to the trigger design, but both have places on my line depending upon the situation.