its ridiculously OP, not many people use it cause its sketchy in battle with lotsa people around so most people dont bother learning it. but on duel lotsa people do it, some of em with like 5% land rate, but so what? theres hardly any risk involved, even if you do get some stabs off on the guy kicking, you have to put your entire focus on stabbing lots in which case they can just stop kicking and either try to get you to glance on a stab (which isnt that hard) or if they are good at chambering, they can chamber your stab which stuns you long enough that you cant block the incoming hit. so yeah, kicking is an issue.