It's almost useless for most situations. The blink ability is too short range to be meaningful, and one turn of invisibilty is useless, no actual time to do anything.
The previous ability (several turns of invisibility) was actually super useful, you could use it to reposition, escape tricky situations, close distance on ranged foes, or get out of range of the deathgaze as it powered up.
But with a short range blink and one turn of invis, all you are left with is a very limited reposition. I invariably find that any place I can actually blink to is still a place of danger, still in range of whatever ranged attacks I am trying to evade, and the single turn of invis is not enough to even step through a door out of sight. The very next turn you are visible again, and taking damage from ranged attacks or hit by the deathgaze or whatever. It becomes a pointless ability, and I find I no longer even use it.
Evan, I beg you to reconsider this change. Even if you got like 3-5 turns of invisibilty after the blink it would be useful. As it stands, it makes using dirk/assassin's blade for Duelist utterly useless. Feels so horriby nerfed as to no longer be an option, which is a shame, because it was such a fun option for Duelist.