Yep! Never underestimate the powah of duel-wielding fully-automatic weapons with independant targeting!
Just last saturday, near the end of my group's Dark Heresy session, my Untouchable scum wiped 4 guys in a single turn with her dual autopistols. The +30 she got from full-auto blast+ close range allowed her to hit on an 85. She scored 6 degrees of success with one of the guns and 4 on the other, for 10 shots altogether; 3 shots for two of the guys and 2 shots for the other 2. The jaws of my whole group dropped, except for our munchkin psyker, who just kind of gnashed his teeth for a few minutes. He hasn't even begun to start crying yet though- ****'s gonna get real once I pick up two flame-pistols and hip-shooting.
Dual-shot, as has been mentioned is great for fighting high toughness units, like orks, who are in general such a pain to deal with; that TB8 is just brutal against those of us who use rapid-fire-low-DPS weapons.. It becomes a lot easier to deal with them however when your two attacks that would normally do 7 and 9 damage after damage reduction combine to do 16 though!
I would advise however, that if you want to use dual-shot you invest in weapons that deal good burst damage, rather than weapons like autopistols which whittle-away wounds over time. Dual flamer-pistols, melta-pistols or handcannons are great weapons that optimize the usefulness of dual-shot. If you use autopistols, I'd advise getting handcannons, since both weapons use the same ammo.