The full review is available here
English review at BLF
German review at my website
Summary
The Wurkkos WK03 is a great entry-level flashlight if you don’t have too high expectations. Costs were saved in some places, but overall it is by no means a “cheap” flashlight. The special “Gold” edition offers some improvements, such as the significantly better Nichia 519A LED or the extra tailcap with magnet.
In the review you can find a code that saves you 20% when ordering from Amazon.
that’s neat, but I’d rather have something with a 21700.