Tried out this build yesterday. Won't change it for a good time. Its just too much damage. The only problem is that the rockets are kinda too much random. Sometimes they just go to barrels instead of enemies. And yes, they can hit the same target. It happens all the time in bosses.
I was using rapid fire instead of Cluster Arrows, but damn, this build is neat. Got luck with my cloak that synergize even more with Ballisticsso I will try this build today. Seems pretty amazing.