Very little stigma about taking the full paid leave and many (most?) women take additional unpaid time. Experience for women and family-friendliness varies from team to team and project to project but my experience was good and everyone was very respectful. The firm offers part-time options, but it seems like it is difficult 1) to actually work less in practice and 2) advance past a certain point in the organization while on part-time.
I think the firm treats women fairly and provides good opportunities. With that said, the hours and the life style of a typical big law firm applies here too, which I don't find very compatible with having kids. I've heard many female associates talking about how many of the female partners at the firm are either single or divorced and don't seem to have much life outside of work.