Looking at a 5-year graph. Indi was on par performance wise with satrix divi (for example) until around May 2012 and then shot up up and away.
Now you have to ask yourself if you expect the big companies in there to keep performing well over the next few years. The 3 big ones are Compagnie Fin Richemont, MTN and Naspers and they make up 44% of the Indi index (this is where the risk mentioned by Almightybender comes in).
MTN is well diversified across many markets but facing mobile termination rate cuts in many and low growth as market saturate. Naspers performance is all about 10cents in China. Compagnie Fin Richemont makes luxury goods (Cartier, Montblanc, to name but a few), the rich seems to have money to spend and again they are really benefiting from growth in China.
Difficult choice you face. I'm in Satrix Divi and Rafi...