To be honest Gin's bankai doesn't really impress me. It brings little advantage compared to the shikai. The shikai is already 100 meters long and I don't think you really get more distance than that between you and your opponent in a sword fight. Unless both participants want it. Besides, at 100 meters an error of just one degree at aiming would already produce a miss of 1.5 meters. With 13km the target would never even notice somebody was aiming at him if you had even half a degree of error.

But I suppose it would work against an army of good for nothing enemies.

Gin is still a creepy fellow, though.