I have never been to Jiko, but we go to Boma every trip. Sometime the members in the travel party differ, but everyone who has been loved it. My step-mother, who is a vegetarian said she was very impressed by the number of choice available to her. We are headed back in June and my eight year old, who is the pickiest eater in the family put that on his list of places to go.
We have never been in and out in under an hour, but we tend to make a number of trips to the buffet - soup trip, salad trip, main course, and desserts. I must admit that sometimes I make the soup trip twice. There have been at least two 2-bottle of wine dinners there.