If it was that beneficial-all the big dogs would be using it. Porting is not that expensive. The only advantage is if you would use it on the bottom barrel of an o/u for your first shot in doubles. Browing seems to be the only company that pushes it on some of their guns. Its cheap to do & is a good sales gimmick.
i think there may be a lil less muzzle rise- but is your barrel backbored? i think sometimes people will but something they can see such as porting and backboring is a much bigger benefit ,but on the gun itself- it doesnt show!
Instead of paying to port your barrel, try the ported choke tubes from AngelPort, COMP-n-CHOKE or Briley...They will do the "mental" barrel jump fix (same as a ported barrel) for about $250.00 less than having someone drill into your barrel...plus you will get the experience in cleaning the ports that you will need if you decide to port the barrels..LarryB