As Hump said, they worked great when I trapped in 70's - 2000. I also made my own using a lot different variations of lures. The most productive were beaver castor mixed with deer meat and vasoline, and bobcat urine/gland mixed with vasoline. I caught a lot of cats and coyotes using it. Of course I did run a lot of traps.
Make your own, it's easy and it lasts a long time. Don't forget to use a visual attracter. It will absolutely bring it more cats when the wind may be blowing a different direction than your cat is cruising.