Level manufacturing quality, no complaints, it breathes careful design. The cover provided is different from the picture is expected to insert the lamp head, no risk, therefore, that it wanders, let alone get hurt on the many fins.
Concerning the power of the lamp, be careful, it is not to put between any s hands, low light mode, retinal persistence is already felt a few dozen seconds, you can imagine at full power.
The switch seems very well made, the 5 modes of use will significantly save battery.
Note that I use 26650 batteries (so large) in this lamp, so I have no opinion on its use with 16650 adapters.
Recommended!