Read an interesting article recently about why scents work.

TheReader's Digest version is that while estrous urine scents may work occasionally, it is the estrous vaginal secretions that really trigger a buck's hormones.

Makes me reconsider spending my money on scents this year as the majority of the products on the market are estrous urine. The urine will get a buck's attention ocasionally, but not 100% of the time and not for the same reasons as the vaginal secretions.