First, there are very few horses that have problems foaling on thier first foal or tenth foal. Backyard breeders don't have to manage 60 horses. These mares look like better than average quality and if the goal is to produce quality using horses then I would bet that he is very successful. At any rate I hope the OP will post some pictures of the horses when they foal and when they are sale ready.
There's nothing like the Rockies in the springtime... Nothing like the freedom in the air... And there ain't nothing better than draggin calves to the fire and there's nothing like the smell of burning hair. -Brenn Hill