I have no personal experience using a ported gun, but I remember an article about them in one of the gun mags years ago. IIRC, the author appreciated the ported .44 magnums lowered recoil/muzzle rise and faster target reacquisition for follow-up shots. The downside was the loss in energy at impact - his bowling pin targets were knocked over much less violently than when shot with a non-ported model.
Fortunately, bowling pins are more easily deterred than bears.
Todd