Has anyone ever heard of this or used it?
I use it! It was offered to us the last time I needed to purchase Frontline. My Vet no longer carries Frontline so this is what we needed to buy. So far I have not seen ONE single tick on Jack and Taz - yet our season is early.
I imagine I had never heard of it because I buy my Frontline on-line....so I never discussed it with my vet.