Originally Posted by Roy
You get a starting stack of 1500 chips and two "rebuy chips" which you can use at any point during the first x levels after which you have to use them. It's basically like a triple chance tourney.
It's during the first 4 levels which is the standart duraton of a rebuy period online. You can cash them in at the beginning or keep them, unused rebuy chips are automatically added to your stack after the 4-th level.
It just offers so much versatility and different strategies. Plus, when people have rebuy chips they tend to play a lot looser which makes the game a lot more fun and attractive to recreationals.