Spent 18 combined hours from ORD-ADD and ADD-JNB the other day.
They were my first two flights on ET and I loved it. The FAs came by frequently to top off beverages, and the meals were quite good in both size and taste.
I flew on a 788 and an A359, but surprisingly, both planes showed some wear and tear. Scuffs left by shoes were evident at the floor level and armrests showed peeling. Not the worst I've ever seen, and did not detract from the business class experience.
The ADD connection was not something I'd like to experience again, though. I had over an hour to connect, but the lines were so long that I still needed to be brought up to the front by an airline representative.
If parked at a remote stand, you'll get a dedicated bus as a business class passenger.