There is a lot of internet rumor on this topic, mostly from people who read about what other people who haven't experienced it read about other people etc...
I have over 15k rounds through my 23c in all sorts of conditions and configurations.
The ported barrel allows for faster follow up shots, reduced recoil, and reduced muzzle flip.
If you are doing single shots that are 1+ seconds apart, you will never notice the difference and the 'c' model will be a waste for you. When shooting controlled pairs and triples, the split times are shorter, I am faster back on target, and I am more accurate with my 'c' model than without.
I would say that as far as recoil goes, it takes a 23c down to about a 9mm with hot loads when doing rapid shots.
The .40 flip is reduced as well.
For this reason, many competition shooters at ports or a compensator to their gun.
Now to the internet myths/negatives.
You will be blinded by the flash at night.
You will be hit by flying debris from the port.
You will catch yourself on fire when in retention.
You won't be able to see your sight.
It is a lot dirtier.
Now for the truth.
The flash from the ports is present, but it will not blind you. The amount of port flame depends on your ammo selection, just as muzzle flash does. The flash from a snub revolver is way worse. It is not long or intense enough to greatly disturb your night vision. I have done quite a bit of low light shooting.
Some debris can come from a port. This would only affect you when firing from retention, and happens very infrequently. Most common is unburned powder, followed by bullet jacket pieces (which shouldn't happen with quality ammo).
The flames will not burn clothing or person. I would not recommend holding your hand directly over the port regardless.
The front sight does get dirty. You will loose the front dot. Then you just have to deal with a post and notch site. Center the post, level the top, bang.
The gun does get a little dirtier in the slide and lower. It takes a whole extra 2 minutes to clean.
If I have left anything out, or you have any more questions, ask away.