IMO, aside from 3ddie, Bomber Oz Kits are one of the best out there.
Get yourself some Homing Cryo or Shock Transfusion grenades (or a Bonus Package), find a distant corner, jump, throw a bunch of grenades, go scavenge more grenade ammo, repeat, win.
Started to appreciate Vladof’s legendary Oz-Kit alot more after it proved being usefull against EOS, and to a smaller extend RK5 (or whatever the damn thing is called).
Acrobat Oz Kits are great aswell.
Anyway, to not dwell off any further, Claptrap can make great use of Bombers I guess.
Personally, I think the Ack Ack works better for Athena. The flak it creates is highly damaging aswell.
Besides, the firerate bonus is granted upon hitting a flying enemy, instead of having to kill it.