Hi wdisneyaholic!
I can't tell you if the AKL Concierge is worth it, because we won't be staying there until November. However, I can tell you a little bit about the prices.
AKL concierge during value season this year is $380.00. A savannah view room is $265.00. So, that's a difference of about $115.00. During Disney's peak season, a concierge room is about $510.00, and savannah room is $340.00. So, the difference in the rooms in peak season is $170.00. Depending on the season, there's probably going to be a $100.00 to $200.00 difference in the rooms per night. So, if possible, you should investigate Disney's value season to see if those dates appeal to you. (This year, I think the value season is Nov. 3-Dec. 20, and Aug. 26-Sept. 26.) That way, you'll be getting concierge for the lowest possible price.
This year, my boyfriend and I are headed to the AKL concierge for Nov. 3-Nov. 8. I was able to book my reservation with a code. The code saved me $923.00 on my package in concierge (We're using the Discovery Magic package)!!!! You can also book room only reservations with a code in the AKL concierge. During value season, people have reported concierge room only rates at about $249.00 a night. That's a lot better than the regular value season rate of $340.00!
So, while I can't tell you if the extra $$ is worth it, I can tell you that there is hope that you'll be able to book AKL concierge with a discount! Maybe someone else on the boards can tell us if they think the AKL concierge is worth the extra $100.00 a night.
Good luck, and have fun at Disney!