I had used a fenix l1d for a little over a year. It´s a great light, and I still will use it for a lot of things.
But I wanted a light that would work better for self defense at night in the home. I knew about the existence of this forum, so I came over here and read and read about the different lights.
My criteria for a tactical light were:
1 - very low light mode for low,
2 - same intensity each time I turn it on and off, and
3 - momentary on
I wanted #1 so I wouldn't have my night vision destroyed. Night vision would be vital in a self-defense situation.
I wanted #2 to support #1 if I had to turn the light on briefly to check something (movement or a shadow) and then turn it off, and then check another section of the room, but not want want the light to jump to 50 lumens.
#3 is for those quick checks while holding the firearm in the other hand.
I found the Quark Tactical to fit my needs. I am happy that the light has the ability to go to bright with the switch of the head, and stay at that level of intensity when I wouldn't need night vision (such as in a somewhat lit room or under a street lamp) but would still want the ability to use the light as a blinding tool or disorienting tool.
Programability rocks!!! I've set my Quark AA Tactical to max on the one setting, and moonlight mode on the other. I use it mostly on the moonlight mode.
My wife is happy that she can now use the Fenix when camping (she used it anyhow, she used to just take it from me
), but even she says the lowest setting on that light is too bright when getting up in the night.
Thus, for the aforementioned reasons, I vote that it is more than just any good, it is a necessity for my lights. I'll probably get a regular Quark for the one-handed mode adjustments, but the Tac will always sit next to the Sig.