I have a 7.5" and I had it ported, I don't think it makes much difference, ditto on the recessed crown. I don't notice any more muzzle blast from it but that's probably just me.
If I was doing it again, I'd probably still get it ported but skip the recessed crown. Great gun either way.
With the porting it does leave residue on the sides of the front sight base but it cleans up easily.
Either way you go there's not really any wrong answer.
