While I'm not quite as vehement as MedicGoofy, I do have to generally agree. I booked one trip thru CAA a couple of years ago and will never do it again. The agent knew nothing about WDW, packages, dining or anything else Disney for that matter. I had to make her re do several things that were done in error, and at one point was seriously considering cancelling and doing it myself thu Disney Reservations. For the 15% off the room, it just wasn't worth it.
I've booked directly thru Disney plenty of times with great results, and am doing it that way for our upcoming trip. As long as you keep your eyeballs peeled for discounts (they should start coming out in a couple of months), I'd recommend just making your Disney reservation now, then as soon as you see a discount you like, call and have it applied to your existing reservation. This way you have full control. If CAA does this for you, you have to continue to go thru them for everything.