I agree with Amanda on this.
One thing with mine I have noticed over the years though, is often the actual male looking saddle feathers go away after their first years molt and just leave that nice thick full rump with lost of extra feathering.
She and I were talking about these type of hens the other day. OF mine, I have only had trouble with one production wise, and it's just that is lays 7 out of 8 eggs as the tiny little dime sized ones, then the 8th is full sized and always fertile. A side note about her though, she was SO cockerel feathered that until she was nearly grown, I had her wrote off as one with poor coloring. Most all of my hens , well a large portion of them at least are some what cockerel feathered. But yes lenght and and fullness of the tail are the most important things to have on a good hen to me at least. Now if you have that, and cockerel feathering, Lord yes use them. They should be a great line.
If they are thin and stumpy, you can try them for a few, but I wouldnt invest a lot of effort in them if the first few didnt show promise.
Will try to get a few pics too come picture day of some of the hens showing this