ORIGINAL: Trex
I have had much luck with the Trophy Rock. As you can see by this picture the deer are actually eating the ground around the rock. After removing the rock they continued to eat the ground and ended up eating a hole in the ground over a foot deep and three feet across.
One of the mineral licks I established with the granulated stuff is now knee deep and almost 4' across. I never hunt near them basically because of where I put them, and most of the pics I get are night pics (not all) but a mineral sight will really get used by the local deer.
Dan