Since the proc lasts for 48 seconds and it's about 1ppm at base dex (main hand) your chance of it going off is pretty high. The regen will persist past the npc's death. On longer fights chances are it will be up most of the time.
There is a mild AC debuff but aggro is not a problem with a SK. If it had a bunch of front-loaded damage stacking dex might make more sense.
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