We used them a few weeks ago for out rat problem, and just two days ago they started on our cockroach problem. Each morning, when I got up to make coffee, as I opened our pull-out drawer where we store the coffee, sugar, etc., I would face dozens of these bugs scurrying off in every direction. As of this morning, I did not see even ONE! Art and his staff do a super job! My wife, Nellie, and I would recommend them most whole-heartedly! R David Zorc.