For my part, I finally got to play against a swarm today with my current defender list (2x Delta with HLC and Janus with Predator) and as expected, it didn't go well. I'll have to try a different approach cause they are vulnerable to concentrated fire.
The strenght of this team is against high value ships. Two HLC shot with focus and 2 dice reroll is very nasty but, if the only targets are of little value, things can go wrong fast, especially if dice is not on your side. Next time, I'll try not to fly in formation. You don't really need the rerolls against Tie anyway. Although oneshoting Howlrunner with Hull upgrade was nice....