I was introduced to Milorganite by the southern growers I bought from many years ago. I was always impressed by the huge fans they sent, and one of the growers became a mentor of sorts when I was just starting. It did wonders for the plants and the deer problems, but the smell was pretty bad. I did a lot of research, and it seemed safe enough, but who really knows.
Last year I started using the alfalfa pellets on the advice of so many good people on ATP. This is by far a much better product as far as total performance of the plants goes, but I doubt would keep the deer away. I used far less Milorganite this year and seemed to have no deer problems, but who knows about next year. Both products are very inexpensive here, but I am more interested in how it affects my health than anything else. I would assume that the alfalfa is a far safer product, and it scares me as I get older to know what we are doing to ourselves on a daily basis.