Pros: - Finetuned for long runtime
- Spring is soldered to switch
- Good switch to tailcup body contact
- Serial connected MC-E dies

Cons: - Not so bright as it can be
- The driver is inaccurately assembled
- Electrolytic capacitor (wet foil capacitor) parallel to LED will soon die from heating by LED. And the circuit won't work without it.
- Slightly greenish tint
- Small defect on head-body thread because hole in the head is slightly offcentered

Other Thoughts: Flashlight uses boost conversion circut controlled by PIC-alike microcontroller.
PWM-controller DIM pin and feedback pin controlled by MCU.
All MC-E dies connected serially and powered near 12 V from boost convertor.
I made some measurements while powering flashlight from 8.0 V lab supply:
HI mode 350 mA on LED (4.2W OUT), 650 mA from supply (5.2W IN) EFFICIENCY=81%
LO mode 70 mA on LED (0.84W OUT)), 120 mA from supply (0.96W IN) EFFICIENCY=88%
Strobe current slowly varies 200..350 mA from power supply.
LED module is massive and made from brass or bronze.

Bottomline: Good, but not perfect thower based on parallel-connected Cree MC-E LED. Probably can run about 3 hours 45 minutes at HI and more than 20 hours at LOW mode. Optimal brightness/runtime currents choosed.

Pros: -Works with 2x18650 2500mA over 3,5h
-Good and homogen light cone

Cons: -Circuit Board had to low output for the Cree MC-E only 700mA! So the light is not so big it can
-problems with flickering

Other Thoughts: -After take apart and complete cleaning the current carrying parts and a little plumbs work for better contacts the lamp works great and without flickering

Bottomline: For a 3 Mode Flashlight with nearby 400-500lm instead of 750lm the Cree-Chip can, the price is to high - then better takes the WF-1000L with 1050mA Output!
The parts are good quality only dirt and contact problems rates the quality down!