For many of the millions oppressed during Apartheid, SA is far, far better now. Don't forget crime was rampant during Apartheid, and police protection was not afforded equally to those of difference races. My family, living in non-white areas, had a total of 9 cars stolen during Apartheid. This doesn't happen anymore. Crime statistics are far more accurate now, and show a decreasing trend since Apartheid, though of course it is still high. This crime remains mainly in township areas of SA - set up during Apartheid.
I'm not sure what you mean by success stories. There are numerous successful companies in SA, especially tech companies in the Cape Town. My family have risen from rags through businesses and professional work, and my father was able to rise to a judge where people are now fairly tried regardless of race. I'd say that is a success in the rule of law. Our government is not perfect (which is?), but it sure has come a long way. Just while growing up in SA, malls have risen, houses built for millions who lived in shacks, universities opened up to reflect the demographics of the population - the country has prospered even during the rescission, and property value and sky rocketed in some areas. I have numerous opportunities in SA, and run a startup there.
I carried out research both at Oxford, in the US, and in South Africa. The researchers I worked with in SA are as highly regarded as their peers in their field abroad (bioinformatics), as highly cited, and are happy in South Africa. I know of people going abroad to do PhD's, then returning to lecture here. I only know 1 other person who has moved to the UK permanently, and this is because they have no family in SA and no higher education.