I think that they have the best tritium illumination
I have had two different military issue watches and a Swiss Army, but the Luminox has the brightest illumination of any of them.
I managed to damage the crystal on mine and now I'm looking for someone to repair it locally. The only disadvantage I guess.
Jeff
BTW I had someone who was in the Special boat Unit that supports the SEALs tell me that they aren't really issue. Doesn't matter to me though, I bought it for the illuminated dial.