As far as I know, most SA Schools only issue SA licences, so on return home, a conversion to JAA Licence would be needed.
Also money for flights, accomodation, food etc. You may end up paying very similar to what you would back in the UK.
I looked at all the options, and reverted back to the UK, due to start the commercials in the next month or so distance (cannot afford to quit work).
Everyone is to their own, but if it doesn't feel right, walk away - you are taking a big enough risk already