The LBX2 makes me giggle. It's just like a single round even though it's an LBX as far as I can tell.
I've heard it's decent for early-game dogfighting, though. I've never had a chance to try it.
Honestly, the LBX2 Sparrowhawk would be a great AA ankle-biter if the Sparrowhawk controls weren't so insanely jerky. For some reason, I can never stay on target with that thing. It has the maneuverability to make up for it, though, and if you get on a Shiva's ass, that Shiva had better pray for friendly intervention because it's not going to shake you.
Still prefer the Hawkmoth C for AA duty, though. Nothing tops that thing's maneuverability and the LBX5s are awesome at killing planes and enemy LRM VTOLs.