I am a worry wart, no round bale feeder for me. My thinking, I'm a lot further ahead cost wise, if one of them gets hung up on a feeder, and get hurt. I just put the round bale out. At first they made a mess. But I made them clean a lot of it up before putting out a new round bale. Now, for the most part, they eat what they want, go off , rest, graze some pasture then will come back hours later to eat some more.
I have always just used a skirted feeder like this. We have used them for big squares too, but they don't fit all that well unless you take some off each end and move it to the side. I have a big square feeder just like this, that we had made.