a 1 attack dice increase at range 1 is questionable. On the Firespray its redundant. On everything else it's not as big an increase to the point it's barely worth the 3 points. Ooh, 4 dice versus 3 on a z-95 at range 1.
I guess I need to say it again: X-Wing is a game of opposed dice, and going from 3 attack dice to 4 attack dice is way more than a 33% increase in firepower. For a mere three points this is a very appealing option.