Yeah its not bad, actually I would agree it is pretty useful. For me anyways, having decap and killing blade popping and needing this. Decap is on such a long timer and really only a 1 per fight CA, I almost always have something else up for it. Same with Killing Blade which I try to use every other Concealment chain (same with decap if its up because of hate loss). But yeah a instant stealth for a quick blast is nice.
Anyways beyond just another stealth, I see it as a second option to jousting which can keep you in melee range instead of running out losing time to DPS. I mean lets admit close range melee is where it is at for us. The instant cast, the decent refresh, and it puts you in stealth which after the AOE drops your right there to give the mob a nice kick in the ass.
Anyway thats where I see its potential. It could be a small but efficient step in the direction to make jousting obsolete for assassins. Which is pretty badass.
My issue is the points needed to get there. Murderous Focus and Exacting are definitely worth some points. Honed Reflexes, I am not sure. With the DW changes I heard haste is more needed then ever, but otherwise when are you not hasted?? Sprint, WTF? I guess SOE couldn't figure out something useful instead of this. <insert sarcasm> Deft Defense, ok for soloing (if your not fighting scrubs). So in the whole line 10 points max toward a goal. So the other half is sub par to get something that is somewhat good but not terrific.
Maybe I am missing something, I dunno.
Poison seems to be where it is at. Frontload is nice with Spikes, Hemo, and Apply Poison all are beneficial. I personally like attribute poison but thats not for everyone. So right there is 20 points to something worthwhile. Bleeding can be worth something since Impale and Assault are decent upgrades, but Excessive Bleeding is meh. MM if you not always raiding. Repeated Stabbing, OMFG!!! 4 of the 6 are useless against Epics, 1 is situational, and other is pretty nice. RS in my mind costs 10-15 AA points to get, and thats pretty pathetic. SoE could of at least made this one alittle nicer if that is the cost. Hopefully they will rethink this in the near future cause RS has its benefits.