I agree with smily1! We always use our local certified Disney TA. She is fantastic. We know a lot about booking Disney, and could easily do it ourselves. But it is so convenient to give her our dates, resorts, specifications, and she looks it all up, gets us not listed discounts and deals. We also get a small appreciation gift. Some are very nice. I got a huge mickey tote one year,, and a really nice photo album one time. The certified Disney TA's get paid by Disney, so there is no extra charge for you. My TA has helped us out many times, and let us know of better deals right away. She has spent many hours trying to get us a resort we wanted, but "wasn't available", and she was able to after a while. I checked Disney site for their offers, and then compared them with our TA one time. The TA had much better deals. She also knows new information, books our flights. She will help with adr's or fp's, but she is not supposed to book them for anyone. I don't mind, as I would rather site down with my tentative park schedule and set those up myself.
So, I guess I would highly recommend a Certified Disney TA, after you have checked him/her out, with others. Sure there are some bad apples in every company, but I would book with our TA just for the convenience, little extra touches, great deals, and peace of mind.