I bought a box of 150 of these. I do understand these are mostly used for monitoring but they take the "chase" out of catching those straggler roaches. I set up around 10 in different parts of the apartment to help me pin point where the real problem areas are. American Roaches get stuck and can't go anywhere. Highly recommend this product for monitoring your pest problem and getting rid of those fast survivors.
These traps provide a poison free, passive method of catching those big roaches (and other bugs) that just love to get into the food we put out for our outdoor cats. I also use them in my vegetable garden as well as the house. They can be placed just about anywhere as they use pheromones to attract and a very sticky surface to trap unwanted pests.