my cats ticks and fleas are gone! they had them pretty bad too...after using frontline for 6 years or so...it was no longer working...i had heard they reformulated, so i called the company first to confirm this info and the customer service person i spoke to said they hadn't....either way this did what frontline could not do for both of our cats in either 1 or 2 days which i find pretty amazing as one of the cats was having some major hair loss from itching/scratching from the fleas so much!!! i'm sold! we had a problem earlier in the season with the tiny deer ticks all over the cats and ended up getting a flea collar for such little money, and it worked great until they started to get the fleas...hopefully next year the ticks won't be so bad or maybe just switching from frontline to advantage will do the trick! thanks for all the reviews as i have always been told by the vet and pet store that frontline is the one to get...but after reading the reviews it convinced me to give it a try and me and my 3 kids are glad we did (nevermind the cats)!