I'm back...
The babies are 3 months old now and I'm still not certain about the gender.
This is the *most* roosterish one of the bunch

He (she/it?) clearly looks nothing like the pics posted by jallny of her 3mos old roo, but I'm still not convinced. As zinia mentioned, they are going through an adolescent molt (there are feathers everywhere!) But, this one hasn't lost/regrown its tail feathers yet, which look really roosterish to me.
I failed to mention in my previous post, that to complicate the whole gender identity issue we have, that I was not present when the chicks were purchased and I failed to emphasize the importance of asking whether the chicks had been sexed. The receipt said "straight run" but most of the locals on facebook who got them this year from the local TSC, got them as pullets. I had though, based on early feather growth, that I had two hens and four roos. Now I'm starting to think that they were pullets and I may have one roo (if this one is, and after looking at jallny's pics I'm not sure about that.)
Does anyone have an opinion on the gender? Pics of your roos at various ages would be wonderful too.