i have used john's stuff for yrs.never any success.alot of variables involved,wind,your scent(or lack of),hot does,had some dinks follow drag lines but never any booners,i think they do work ,all the cards just have to fall into place,late season may be better when they are looking for the last few does to breed.he has some good product,hope it works for you,tricking that big boy is very rewarding!