We were there in October, and ate at both Jiko and Boma. Boma was very good, a HUGE selection to choose from. We (daughter and I) have peanut allergies, and the chef came out and walked us around the (huge) buffet, telling us exactly what was in everything. I just expected a verbal list of a couple of things to avoid, but wow, were they thorough. There are lots of dishes that I was naturally unfamiliar with, but there were plenty of things that looked familiar as well. We are definitely going back next trip.
We also at at Jiko's, and my steak was outstanding. My little girl and my Mom really enjoyed their food as well. Great atmosphere in there, too. (and not as noisy as Boma.)