i've fed it mixed with soybean hull pellets and wheat mids for three years now. right now i'm feeding sb hulls (pellets) and corn gluten (pellets) 50/50 and they love it. i feed it to cows and calves, its about 14 % protein. the last load i got, it was $9.45 a hundred picked up in bulk.
i wouldn't be afraid to feed it by itself, but i think its better to add the sb hull pellets to make a more complete feed ration.
lots of folks around here feed the 3 way mix and some feed straight sb hull pellets