I just changed our ressies for AKL in December to Concierge - I checked and the difference in price between our AP deluxe (we have 5 people in our family) and the AP Concierge was about $35 a day. If we eat breakfast there we have already saved that much! Of course, one of the days is a Tuesday, so we probably will go on the Sunrise Safari - so much for any savings, but what fun!
I called concierge the same day I changed my ressies to see if there was availability for the Sunrise Safari, as our trip was about 35 days away, and Jill was extremely helpful. Not only did she set us up for the safari, she took down all kinds of information about our requests, and offered to make any arrangements I needed. Of course, I had most of my planning done by then, but she was very helpful! If you want them to try for anything special be sure to call them before the 60 day period, although I've heard they can even sometimes get CRT ressies a couple of days ahead of time?
Later that day, I received a call from Jill. She had just received my ressie from CRO, and didn't realize it was the same people - our name is St. Martin, and it often gets misfiled under Martin. She was very apologetic, but I thought that was pretty fast service!