As per general combat rules, for 2 threats or 1 despair of my attacker's result, I can get a boost die for my next check. It is applicable for any check, can be used against anyone, and this is free (no Xp cost).

Counterstrike works for the same 2 threats or 1 despair, but with a lot of restrictions. It has to be a missed attack, it only applies for a lightsaber (cunning) check, and can only be used against my attacker. And of course I have to spend 15 Xp to get this.

I do not feel that an upgrade is SO much better than a boost die. Of course, somewhat better if an upgrade gives a new green die, and even if not I can count on slightly increased chance of triumph. But not a huge difference.

So considering all the restrictions and Xp cost, do you think Counterstrike is useful, despite the fact anyone can get almost the same bonus for free? Or is my interpretation of the talent wrong? Did I miss some important factor?