I have tried just about all the "products" out there over the years, deer cane, black magic, come here deer, etc......
I agree that regular salt blocks work very well. I have also seen that deer in our area like the trophy rock, but the the real "winner" seems to be Lucky Buck. This stuff seems to really draw them in. Like the picture above, the deer have created a hole about 3 feet deep, and 5 feet around. There are different sites located around this one with some of the above products, but the Lucky Buck site is the most worked over. Now I do not follow their directions as it is a little costly. In fact I did not put any out last year or this year, and they are still hitting the site this year.
I did try another product a couple of years ago. The Apple Rage and the Acorn Rage. I did not have much luck with the Acorn Rage, (but that is probably due to the place I hunt is an oak forest), but the Apple Rage really drew them in, to the point that matriarch doe would stomp away any other deer that came near it. I ended up putting up another 2 in that view of trail cams. Got some great pics.
I believe, it is just a matter of having "something different" from what everyone else has out. Since the area I hunt is largely agricultural with thousands of acres of corn, soybean, alfalfa, wheat, etc..... The deer can be picky. Thankfully our wood tract is surrounded by all the above fields, and we have several small ponds in the wooded tract.