FWIW, this is the first year I have tried ANY type of protein feed. Here's a couple more pictures of some other backs at another feeder. I have owned this ranch 20 years and this is the best crop of bucks yet. Does it work?? It would be hard to convince me otherwise. Note the other feeder has a 16' fiberglass ladder nearby. Much tougher for my 82 year old [censored] to climb than the squat feeder in the first photo.
I probably have some early photos of the first buck (I am guessing him to be 3 years old) but with no ear tag, hard to say if he's the one.