If you want to show them, no. They are not show quality. If you want to be assured of the dark eggs, no. They do not vigorously cull to develop those properties. They tend to ship chicks that will grow up to have the general coloring the Marans have and that may lay an egg darker than many other chickens. The hatchery Marans tend to lay a little better than Marans in general. Hatchery chicks tend to have the general Maran body configuration, but they don't severely cull for that either. If you want show quality chickens or guaranteed dark eggs, you need to order from a breeder that specializes in that.
Not all people that call themselves breeders do really specialize. Some specialize in raising Marans that conform to the standards of perfection and will win the grand prize at chicken shows. Some specialize in breeding for dark eggs. Some do both. Some get hatchery chicks and just hatch them, not really culling for standards and call them Marans. Most will be honest with you about what they are breeding for, but all are human.
Not all people that call themselves breeders do really specialize. Some specialize in raising Marans that conform to the standards of perfection and will win the grand prize at chicken shows. Some specialize in breeding for dark eggs. Some do both. Some get hatchery chicks and just hatch them, not really culling for standards and call them Marans. Most will be honest with you about what they are breeding for, but all are human.