Primitives don't need 18% protein, 16% is more suitable. I've not seen such a palaver about copper on the ingredients list before, so for that reason alone I would not have bought it. Also 'confectionary products'??
Ours love the stuff with lots of bits and have never had pellets or rolls so I don't know if they would eat it. The lambs love the bits of rolled maize. Ours is Carr's Champion Tup, suitable for all our sheep.
Maybe you could mix this with your usual feed half and half?