It gives you 5 frame advantage. Good follow ups I like is :6::f:, which again gives you 10 frame (which is basically the same situation. Another one is :6::P::K::2::K:, which again leave you at 5 FA, also you have :6::K::2::K:, which also give you 5 FA (see a pattern here? :)). :h2::K::K: also...