Have used frontline _13 ticks after one walk
Moved onto Advantix - 6 ticks each after one walk earlier this year
Now on Billy No Mates and yes we are still picking ticks off on a fairly regular basis but there is fewer of them (only been using it 4 weeks) and their coats are so soft and even Kooki's dragon slayer breath is improving.
I have yet to find a product I would swear by but BNM and an O-tom seems to be working for me.... Now if I could only get something to sort out the OH he came back from walking last weekend and I had to take 7 ticks off him lol