We have stayed at AKV concierge level twice now, one in April and This past month. Overall, we think the concierge level is over hyped and not worth the points. You don't even get guaranteed Savannah view. The turn down service was nice, but not necessary. Most of the time we were too busy with other activities to really use the lounge for snacks. The best part of the lounge was for breakfast.
The one really nice benefit is the ability to book the sunrise and sunset safari. The sunrise safari can not be beat and is a terrific experience.