Pros: What can one say about a 16-hour flight? It wasn't intolerable. SAA economy gives you a bit more legroom than some airlines on long-haul flights. Crew was competent, pleasant. Food was palatable.
Cons: In-flight entertainment system had some kinks. In some seats it worked OK, in others not. If you get a working site, there's a wide variety of films & music to choose from.