Protein tubs have been gaining in popularity here lately with both small and large producers. Smaller producers like the fact it is self-feeding so they do not have to constantly be there. Larger producers like the fact that it requires less labor than say feeding range cubes/
People like the convenience of having a supplement that is designed to be self-fed in the pasture. They can deliver supplemented nutrients that does not require extra labor.
But like with every supplement there are pros and cons to consider when using a protein tub. As a producer you should weigh each option to decide if it will work best for you.