Got another one of these for my 2nd CQB rifle set-up last week (a SIG 516)
They are $90 LED WMLs w/ 120 Lumens.
Mounted it tonite on my SIG 516 to practice some night time house clearing.
(there is not much "house" tho.. so I suppose you could say I just walked around different corners of the apt in the dark orienting myself using the strobe from my WML with the rifle at "ready point" )
Again what I like about this light it is so unobtrusive when not used.
Its light (only 1 btry!) has no edges, doesn't jut out from the rifle much so adds very little bulk or weight..
Now if I was a SWAT team member conducting night time raids as 95% of my "business" my PoU would be different and I would desire a more powerful and substantial light and the extra weight/bulk/cost would be almost immaterial to me as the light is so critical in that PoU.
But as a civilian first defender my PoU needs this: a light that's so unobtrusive you dont even notice its on there, until you may need it.