I am staying at BWI concierge in Jan, my first concierge experience. I must say, the CMs have been SO GREAT making our PS. I have always found it to be a big hassle to make our PS reservations, then changing them when our trip plans change.
I rec'd a packet in the mail about 120 days out from our reservation from the concierge planning office. I filled it out with our requests and sent it back to them, US snail mail. Then, about 90 days out from our trip, I started receiving email updates as they were able to get our PS. They were able to get all of my requests, even the 805a Cinderellas Castle (7 people)
When WDW changed the early entry to Extra Magic Hours, the CMs at BWI concierge changed my PS with no problems & were extremely pleasant about it, too. They have been great about getting information to me when I send emails with questions. So far, it has already been worth the extra money we are spending and we haven't even gotten there yet!
I do believe that if you staying at concierge level the service of booking your PS, Cirque tickets, Illuminations cruises, spa appointments, etc are part of the package.