I have been using it for about 7 years now and have never had any problems with it so far. I use it on my boots and have had deer walk right in the same path as I did and not seem bothered.
I use a Scent Lock suit and Scent Away spray both at my truck and at my stand. I shower before I leave if I have time. Keep all my clothes in a plastic tub or a heavy duty garbage bag to keep clean.
So call it waste of my money or time, but I have 5 brand new bottles on my shelf in the basement not including the 2 in my tote and 1 in my backpack. I like it.