Wimps...the 50 cal is just fine. Even those who 'spray and pray' have a chance. For those who can aim worth anything they kill just fine.
(Full disclosure: I fly the 190A5, which has the 20mm and bb shooters. I strongly suspect the 2x20mm/2x.303 loadout is not much more weight/volume on target than 6x0.50 of the PonyD, which has a higher rate of fire.)