WOW. That's all I have to say is just... wow. This markers is so phat, so drippy, so juicy, etc. Covers everything. Really good marker. But I think $17 is a little much.
This stuff is definitely different than what comes in the k60. As far as if it is the original formula? It is not but it is really close. This stuff is bomb af though so dont sleep on it, also i bought one just to fill up my markers because using this mop would be a waste of ink.