Tried the bagged mineral and a mixture someone was selling in Kansas, wasn't impressed with the results. Only saw a few deer each night go to it and after about 2 weeks, nothing was going to it.
I know a guy in ETX that swears by it and has the pictures to prove it works.
From what I have read, it depends on what the soil has already in it, what the deer are craving that they aren't getting naturally and what type you put out. But my knowledge is severely limited when it comes to minerals.