In my opinion, ADP has been one of the most employee and women friendly organisation I have ever worked with. In terms of their focus on nurturing women leaders, or ensuring that they have a safe and comfortable work environment, they are always market leaders.
ADP however does not allow one to carry cellphones on to the floor for some businesses. I am mentioning this because I worked there when my daughter was 2, and I used to have trouble ensuring being available for the daycare folks to reach me sometimes. However, this policy has been made specific to some businesses only now and it might help to check on it.
Lastly, some of the work in ADP has to be done on office computers only, which means you might miss out on flexibility like work from home options. However this again depends on business and level. Managerial levels have laptops and blackberries that make it easier to connect from home.
ADP Solutions is wonderful place for women and the support you receive from the management and coworkers is amazing. They take care of you very well like family.
From my experience with them. I no longer work for them but one would love to work with ADP solutions.