I planted about 2 acres of them last year as an experiment. Two separate plots, both surrounded by corn on 3 sides. It was interesting, the deer were in them early. It was common to see 5 or more deer in the plot at a time during July and August, but come september...nothing.
We had turnips the size of softballs with huge leaves so I was hoping that come november they would move back in and eat the leaves once they dried down, as their leaves get quite sweet late in the year. Rifle season came and I never saw a deer in them. Even watched to see if they would paw at the turnips during the winter months...nope.
Always heard they were great for deer, and maybe they are, but I'm thinking they like corn better at this point.