BARTMAN:
One more "no" vote.
Everything I shoot at targets (a 32" XT trap, a 30" Citori trap, and a low rib 90T) is ported. The ONLY reason is that they all came that way. I didn't and wouldn't specify porting on a new gun and wouldn't spend a nickel to have an aftermarket porting job done.
IMO porting does no particular harm but no good either. And... it is ferociously noisy on short(er) barrel guns. I don't shoot big bullets but the 30" Citori still makes one heck of a racket.
sissy