Thanks for the awesome reviews Selfbuilt! This review in particular helped me to finally decide on the T40CS. I only have a few other lights to compare with, but the T40 blows away my Eagle Tac M2XC4. I've used it for several months and am very happy with the T40's performance and handling. I use it primarily for walking the dogs and for wilderness backpacking. The throw is great for spotting hazards either on our walk or in the mountains. The low beam is great around camp or for removing thorns from the dogs paws, etc...
I've done some unscientific tests for throw and find that 500M effective range is quite realistic. Aimed on mountain sides that I know are 500M away, I can actually make out the outlines of the mountain (on an otherwise dark night). Of course, our terrain is rather light in color, so it's easier to see, but that's still incredible. At 300-400M the light is very useful even for making out details. The desert air is quite clear and doesn't have much water vapor, so this may not be true in all environments.
I also very much like the electronic interface. Works quite well. My only complaint, if one can call it that, I have a difficult time finding the electronic switch by feel. I'm going to put some fancy knot work on the battery cylinder so that I can more easily find the switch by feel only.
-- Bill
It has and bigger hotspot so it can even light up more at 500 feet then the pro1 so the T40CS is now my best thrower. Finally found a light that can beat it. 
At least its only 78 bucks
