In the past I have had Marans from some of these great lines, but I think inbreeding and egg color has trumped production and vigor for many breeders. I had all but sworn off Marans until a good friend of mine gave me her stock - she told me they were regular layers and lay a super dark egg. I didn't believe it. To my surprise, it was true, so now I am lucky enough to have Marans that are good producers and have good egg color. Have had no blood spot complaints, either. I think the quality and utility of the birds has a lot to do with the practices of the breeders. Also, I think most marans nowadays have some heritage of those famous lines, but if they are all just from those lines, they are really lacking genetic diversity. I am planning to selectmy breeeders at this point not from lines, but from production, egg color, vigor and appearance, in that order. Just my preference.