I was going to answer but see you found one.
I was online reading about the different flea meds - and there are reviews if you go to 1-800-PETMEDS
HERE is the one for FRONTLINE PLUS
Frontline Plus - 1800PetMeds.com
I found THIS about K-9 Advantix
and I just bought some (wish I saw this before I spent the $$). I'm sending it back. It says it causes a burning tingling sensation for 3 days and I'm SO not doing that to my girls. We've been using Frontline Plus and while I don't SEE Fleas -they're still scratching
K9 Advantix - 1800PetMeds.com