I've had several experiences of SandHill and one batch was good and the others were less than ideal. Not my idea of preservationist because most of the chicks that grew up were less than ideal according to the judges. Too many of them were less vigor, bent toes and majority died before laying age, in one case, the entire flock of Mahogany Favs all died before adulthood and it was disappointing. Looks more like hatchery run than culling out the bad apples in the flock particularly with the Orps with yellow legs......
Would I buy them again? It depends on the breeds and watch what others have bought and what they didnt like or did like about certain breeds. However I would NOT buy their Polishes, Faverolles but pleased with the Australorps, and Buff Orpingtons, they got the size and egg laying capablilities.
They are pretty good in the "common" breeds like the Aussies, Orps and Barred Rock breeds. It would be interesting to see what else folks got that are better than the hatchery bred birds.