I just spent a month in South Africa (visiting from the U.S.). Part of my stay involved a road trip from Johannesburg to Plettenberg Bay on the Cape. Tom Tom Southern Africa proved to be a great help. The maps seemed accurate and up to date and the driving directions were spot on. It even got me though the tangled mess of motorways surrounding Joburg as I made my way from and back to the northern suburbs without any problems at all.
lerico about TomTom Southern Africa, v1.6