I really don't intend on hijacking this thread, so I apologize for doing so.
Many of my colleagues are opting for the compensated versions of their current pistols whether it is the .45 or .40. I don't think the flash from a ported firearm will cause much distortion to the shooter's night vision. When you weigh out the factors (stress, threat-movement, etc.) which affect re-acquiring your target either in low/no light or even full light scenarios the flash from the compensated models are pretty low. The benefits of having a compensated pistol will outweigh the flash.
Having said that, I have to stress the importance of practicing in a low/no light situation. Many here will agree with me when I say that eliminating your threat is the only goal and the shooter must know what and where that threat is. I agree that muzzle flash will affect the shooter's night vision, but compensated models are not the only firearms that produce this flash.
Again, I don't want to pull this thread off topic, but no/low light shooting is very dear to me because of an event that happened years ago. Neither I nor anyone near to me was directly involved, but it has left a lasting impression on me. An individual got a firearm for home protection. In the early morning hours they fired on a perceived intruder and ultimately killed their child. Not knowing the target by not seeing the target is bad, very bad. So, I agree with the advice here about night vision, but there are other factors such as flashlights that could be help.
I truly believe that a compensated pistol will benefit the shooter and the muzzle flash isn't that major of decision to make you decide not to get one. In fact, a compensated pistol fitted with a light would be my choice. I say my choice and it may not be the choice of everyone. I'm not trying to start a problem here. I just wanted to offer my opinion. OK, I'll go back and sit in the corner now.