I have one from Tmart marked "mdxl 3w" and it's pretty terrible. Its bright enough i guess and its never failed on me, although ive never used it aside to check if it still works. I believe it was closer to $10 a few years back. But it's so short and compact and seemingly reliable, its worth trying for 4.99!
Ya, the blue ones match the color of the led haha, for $5 I think they're pretty decent...super small, decent finish, output on 16340 is acceptable for the price...but it's super easy to drop a different led in these. Of course they tailstand wonderfully. Don't expect a $30 light and you won't be disappointed.