I saw the YouTube comparison video on my WK03 and the Sofirn 18 that is basically the same light.Yup, Sofirn makes all of the flashlights for Wurkkos.
And, Sofirn has a policy of selling lights that use only a side-switch; with no magnetic tailcap. If you want that feature, they'll sell you one for a few bucks extra and ship it with the complete light. Makes sense Wurkkos would have that same policy.
I went wit this one because i wanted to see what a $25 light was like. So far it good. Now just waiting for the night. Lol