We were at AKL the week of Thanksgiving. Most mornings we walked right past Boma on our way to Mara for breakfast. It was always very busy and there were people in the waiting area. I would do an ADR just to be safe.
We did Boma breakfast the morning we left. We actually were disappointed in it. The African dishes didn't appeal to us, so all we really ate was the "normal" breakfast items. I would have been just as happy at Mara for a lot less money. I'm glad we tried it because we always wanted to based on reviews, but we probably won't do it again. Just not for us. We still love Boma dinner though!