I agree with Bill!
I just recieved my TK70 and just fired it up, here are the good bits.......
I have lots of lights, souped up hot wires, leds, and hids, this light didn't blow me away (because I have about a bizzilon lights?) but it did impress me in a big way.
I LIKE the fact that it uses D cells, you can purchase an extra set of four for $30 (I'm using the Tenergy LSD 8000 mAH cells), an extra "set" for the Olight will set you back $110(?)
It has four levels and the low will last for 6 days(?), this would be good if you are in a bad weather area (low is pretty bright IMHO) and you could also run 3 cells if you don't really need the turbo function.
It puts out a lot of light for a LONG way, i'm use to a lot of light with a wide beam for a shortish distance or....a light that has lots of throw with a "skinny" beam, the TK70 has a WALL of light for a long distance.
As Bill did state, I don't like proprietary stuff either, it's just to creepy IMHO, get the TK70 along with 2 sets of D cells and have a great time with your light! (Cough.....Maha 808M charger :thumbsup