They work sometimes.
I think people have to be realistic about scents. If they worked all the time, they would be illegal. If they never worked, it wouldn't be such a massive industry.
Because of the nature of an estrus scent, it will likely only work part of the year, if at all. I'm guessing the seeking/chasing phase is going to be the best time to use an estrus scent. I got the biggest buck I ever shot the first week of November several years ago by hanging a wick with estrus urine on a branch near a mock scrape I had just made, about 25 yards in front of me. The buck was following a doe, and the pair were on their way to go right behind me. The buck raised his head and sniffed the air, made a sound I've never heard from a deer before or since, and turned 90 degrees to walk toward the wick. I shot him the a crossbow at about 20 yards. I would not have had a chance on that deer without him turning to investigate the estrus wick.
I have also used estrus and other urine products on probably 10 or so other hunts. So if the product works 10% of the time, and it costs me about 7$ each time, it's about $70 per buck so far. I consider that to be worth it.