I've not used the block, I bought some of their Liquid Luck , poured it on a mineral spot and poured some on the tree so the scent would carry, had a camera covering it, almost no activity for the 3 week period I had a camera out, odd smell to the stuff, some people swear by it,, I had zero luck with it.
I pored their Liquid Luck on the ground in front of my ladder stand and the wind was blowing in the direction that the buck came from and walked straight to it. That was 45 minutes since I pored it on the ground.
I like it. I put some out last weekend and had to new bucks show up that I had not had on camera all year to go along with all the other deer I typically see on it. I'll be buying more of it going forward. I did not have any luck with the liquid luck at all though.
I put out some Big & J BB2 and I had trail cam pictures of them stepping over it. When I went to pull the card it was all still there molded. They will eat 100lbs of corn in a week but wouldn't touch the stuff at my place.