We have American Guinea Hogs. Not sure if that is the same animals you are talking about.
I am very pleased with them. They are good grazers and have a smaller maximum size so they are a bit more maneageable in that way. We have a breeding pair, last year the sow gave birth and raised 8 piglets. The piglets were about 60-80 pounds hanging weight after 6-8 months. the piglets ate almost exclusively grass, acorns, and scraps from the kitchen/garden. so, the meat was essentially free, no substantial outside imports.
over winter (when there is no grazing) we feed the alfalfa hay, kitchen scraps, sprouted barley/wheat, stored and dried acorns, and mangels (fodder beets), and whatever else we happen to have (old potatoes that get cooked, spoiled squash thats been cooked, fruit,
rose hips, etc)
I agree with other folks who have suggested to keep the pigs rotating in order to reduce rooting. I never keep the pigs penned up in an area that I am not OK with them rooting to death. We generally pen them up in the winter in an area we are planning to seed. We have mobile housing which provides them cozy
shelter and have to haul
water to them in winter. but that is expectable since everything goes into deep freeze into winter (ie it is hard to run a house in the winter time).
all and all I love the American Guinea Hogs. They are very loveable and very hardy, not too aggressive, and from what I have seen they have good mothering instinct.