rocket 2 has a newer designed amp, and the curved box reduced sound wave defraction. Basically means your `sweet spot' will be larger, which is pretty useful, especially if you have mates around who are also listening to your shit on the monitors. if you have some more money to spend though, dont get rockits. KRK are 110-240V switchable, import some V6s from overseas, will cost u 200 bucks extra and you will not have to upgrade in a years time.