I’ll let others comment on the build quality and ruggedness of the device itself, but I was not concerned with it during my time using the light. I thought the ‘intelligent’ features in the tailcap were nice, displaying battery level as well as being able to set and remember power settings. The remote tapeswitch also had an intelligent on/off so that the tape and the button at the back of the light would still function independent of each other.
While the picatinny mount had lower quality screws and hardware, it clamped fine to rails. In my usage I ended up shining it much more handheld though off the gun.
If seeking an ‘out-of-band’ illuminator with less visibility from the target side, you’re going to need more output power to give a similarly bright illumination downrange, and this added power comes with extra visibility. I would think sticking with the lower wavelengths and having longer battery life would be more preferable. For those in situations where signature from the target’s view is of utmost concern, laser-based illuminators offer advantages in their ability to focus precisely that would make them a better option than the LED devices.
This is an unpaid summary of my thoughts about a product I did not pay for. I do not have a professional relationship with NiteCore.