I have Targeting Astromech in two of my builds that I've done pretty well with. One of them is Hobbie, of course; that list has gone 12-3. The other has TA on Dutch Vander paired with a couple of B-Wings; they are 8-2.
I put Autoblaster on Dutch and slam him into the thick of things with 4-straight or 4-K. If he bumps, he still gets his target lock, which he shares with one of his friends. If he doesn't bump, he is usually in range to use ABT. It is a tactic that is entirely reliant on TA.