The ranger boss in Elona Reach uses it (if he is not in that mission, he should be in dunes of despair) You could also check the skill database
I have found few uses for this skill, though I like klmpee's idea. The only time I place it on my bar is when I go interrupt, as I can then use concussion shot and still keep my energy at a reasonable level for debilitating shot and distracting shot, as well as any stances I might be using.