Picked up to Arc-170s last week and was able to run my first list with them last night:
Norra Wexley (29)
Alliance Overhaul (0)
BB-8 (2)
Tail Gunner (2)
Seismic Torps (2)
Shara Bey (28)
Alliance Overhaul (0)
R7 Astromech (2)
Weapons Engineer (3)
Seismic Torps (2)
Biggs Darklighter (25)
Integrated Astromech (0)
R2-D2 (4)
Squad Total: 99
Probably not a competitive squad by any stretch, but I wanted to fly two Arcs and try out the new Seismic Torpedoes. My buddy was flying two Protectorates (Fen Rau and Old Teroch) and two Z-95s (N-Dru and Banana). I managed to catch three of his ships (both Protectorates and the Banana) next to two obstacles on the 2nd turn and had some Seismic Torp fun. The damage from that initial attack took his ships down far enough that I was able to mop up pretty easily after that. All in all, I was impressed with the Arc, the look sick on the table and are pretty fun to fly . . . not quite as sluggish as the Y-wing or B-wing, though they're still very slow on the turn around. I'm looking forward to trying out some more builds featuring the Arc . . . and that leads me to my question: what are other people running for Arcs?