As a breed? I don't know anyone who has done it. As a hybrid, I've done F1's and really like the results. The cockerels weren't much compared to regular production Barred Rocks. About the same in size and similar in looks. The hens, however, were beautiful black sex links with soft feathers, nice producers of abundant brown eggs and a few streaks of red in the neck area. Very docile, friendly girls that made a nice addition to the flock.
Thanks Marengoite! Sounds like you had fun with the F1s
Anyone else working on this as a project or already have a strain that is barred?