I like this design because you can put a Tom Cat rat trap in with the Contrac bait. I bought 6 of these when I fired my exterminator, and deployed 2 in the basement. Checked them for the first time today and had 2 big dead rats in them. Putting out the others today. Gave the unit 4 stars because one had a poorly molded "hinge" on the cover. Best solution for my situation so far and I have tried others.
While I appreciate the design regarding its weight control and above ground bait table, the locking mechanism does require extremely gentle hands during cold winter months in Idaho. I have broken several locks simply opening and closing them. My suggestion to Bell would be to consider a slightly softer plastic with a bit more give in the lock area that could flex a bit more in sub zero.