Not used the pig but used their premium ewe nuts and pedigree ewe nuts and both are eaten well by our stock. I phoned Harbro a couple of times about various things - they said it wouldn't be cheaper getting it from them direct so just go to your local supplier. They are a little more expensive but even the look of the feed seemed better quality and is definitely more palatable to our sheep.
But as HH says, it is food and there is a 3 months time limit on it - you may need to split it with some piggy friends.