never had any luck with it, I've used frozen/fresh, no preservatives... I don't think that stuff lasts very long, and I don't like the idea of preservatives.
Honestly, wash your clothes with no scent wash, spray down with scent killer before going afield, these are my #1 and 2 best scent ideas.
scent lok might help but I'd put it below these other 2.
I've never had estrus lure in a buck. It could help mask your scent, but I worry that if/when it spoils it'll alert more deer to you than attract, also preservatives in other brands I'd worry again deer would know the difference and know where you are vs. thinking nothing is there...
plus more $$ to spend, more time wasted getting ready, not my deal.