A lot of people are talking about dash, but forceballs are just as important. Your forceballs really set up your dashes. ITs hard to explain without going into detail, but once you get your opponent respecting a fast forceball, you can put a slow forceball on the screen and at certin ranges they cannot react quickly enough to get around it, therefore opening them up for a whiffed elbow dash into a blockstring. Reps bigggest strength imo is that using his forceballs, his acid spit, his d4, and his elbow dash he can really control most other characters movement. Plus his oki game is ridiculous.