Re: Glock night sights
The Tru-Glo sights have a long, thin front sight that is fragile. If this is only a range gun, that's not a problem. The fiber optic rods in the Tru-Glo sight occasionally fall out. If this gun may be subjected to hard use, the Tru-glo sight are not a very durable sight.
With regards to the different colors of night sights available:
All night sights that use tritium degrade over time. The half life on the green sights is about 10-12 years from date of mfg. What this means is that the will glow half as bright 10 years from now. Tritium is radioactive and will degrade like other radioactive materials. The half life for other colors is substantially shorter that the green. Red is the shortest half life, being about 5 years, I believe. Orange and Yellow are fairly short as well, being between 6-8 years. If you are concerned about how long your sights will last, stick with green.
Heinie, Trijicon, Meprolite (aka Tru-DOT or Kimber), PT night sights, and Novak all make excellent, durable sights, in a variety of styles.
I usually recommend that you stick with one style of sight when you transistion between multiple handguns for tactical use. (i.e. all straight eight, all 3-dot...) If you use one gun primarily and everything else is just a "range gun" it isn't such a big deal, but if you get used to one type, then transition to another and use it under duress, you can slow your reactions down as your mind adjusts to the different sight picture. This shouldn't happen if you are point shooting (or the "flash front sight picture) at close range, but you may need to get a quick round off at 15 yards, and at this range you should be starting to get a full sight picture again.
Craig