I flew them last year in Biz Class to Doha. They are pretty good regarding service, food etc.

My only 2 comments would be;

1. Going via Doha would be a very long way round to get to SA! Must add a good 5-7 hours on to a direct flight with connections etc.
2. The seat was on a real slope when 'flat' (far more so than Singapore or Cathay Biz Class).

All in all, I'd happily fly them again for a good price, but in this case, I'd say IB, or WTP may be a better option.