The ports work fine...can't really tell the difference between a ported 4" and a non-ported 4" except on an indoor range where one can see the flash come out the ports. They do however noticeably reduce muzzle climb. In shooting a Model 58 with ports vs a 58 without the recovery time with the ported gun is less.
I have three Taurus .41s, two 4" and a 6", a 3" 657, 4" 58 with Quad-Ports, Freedom Arms 6" and a 60-10 .357 Magnum all ported and they are some of my favorite shooters...YMMV
Bob
