Delayed wakeup will pretty much protect you from the unblockable, since the active window is so tiny and it's too risky to delay the unblockable in anticipation of just that. Furthermore, a lot of characters can simply tank the damage with EX wakes, and punish you with a full combo of their own. As a wakeup, the unblockable is definitely not my first choice. It's still great for breaking down turtles though.