Depends. It depends on your budget, your speed and your current opinion on your cube. If you have the money, sure go buy a new cube. If your cube is good enough for your speed, and you don't need something new (really, unless you have a bad Zhanchi or keep popping it you don't need a new cube. ) you don't need to buy one. So only buy it if you have the money, and feel like you need a better cube to get faster. (Not necessary to be faster though)