I’m very happy with it. It’s lufenuron, which doesn’t kill fleas, but prevents their eggs from hatching. If you have a bad flea problem, you use this together with something like CapStar (LCDs also sells their own generic of CapStar) to kill the fleas outright. Once fleas are under control, this is fantastic. It’s not a pesticide, which is why I like it, and in the event of an accidental overdose, it’s still non-toxic. Best of all, it’s cheap! I’ve got my cat and 130 pound rott mix on this for a year for $85. The rott takes a double dose of the larger pills because of his size, and the cat takes a single small pill, every month.
