I personally love the curtain and was going to use it for all sorts of things with the new pull feature. For example void into blurred frenzy, void into oil pots in WvWvW, to kite by pulling my foes away with the void and using warden to reflect projectiles, to escape confrontations. Using the void to pull foes and then locking them down with the moa and stuns for focus fire or aoe nukes on a group of enemy players. Using the void to effectively shatter. I like the warden as well. I just feel as if the swiftness is low for a skill on a 25 second cooldown. So you see, I've already thought of many ways to utilize the focus. Im not just using it for the swiftness.
We shouldn't have to heavily trait and specc for mobility just to be somewhat on par with other professions heh.
Glad to see another one that considers it a worthy weapon than just a speed buff