I think I might have posted it before but when picking a good cockerel I always go for one that has a tail above the horizontal. A good rooster will have a heavy tail that will weigh it down. If it has a horizontal tail as a cockerel it will have a droopy tail as a cock. Always look for the best bright yellow bottoms as well. Hens should have the spur 'scales' as well, atleast 3. I have seen quite a few inverted combs on hatchery stock. Even as chicks they should have black faces and good sumatras will keep black faces even when kept inside for a few months. Keep an eye on feather width, alot of the sumatras I have seen at local shows have really thin wispy looking feathers, I like to see average wide looking feathers. Make sure they arent too loose. That has got to be one of the things that bugs me the most is the loose feathered sumatras that are showing up all over the place, they are an oriental type and supposed to look more gamey instead of fluffy domestic birds.