It's been a month since I reported on Benjamin's walking ability. I'm not sure when I can definitely say that he is officially walking. This week however, we saw a marked improvement in his range and confidence.
He can go much, much longer now, across our apartment. He can change direction, stop and then continue. He will even recover from near falls.
I believe the only thing holding him back a little, is the fact that in order to stand up, he needs something, an object or person, on which to pull, lean, or support himself. That is, he can't yet get up from the floor unassisted. When he falls, he just starts to crawl, rather than get up and walk some more.