I bought an assortment the last time they were that cheap.
They're Smart clones. They work, and are reassuringly bright. They feel fairly cheap, but don't appear any more likely to self-destruct than the real thing. The bracket compatibility with my proper Smart superflash is a bit unidirectional (either fit the Phaart bracket, but the Phaart is loose in the Smart). Excellent value.
The Strap-ons are worth it purely for the batteries. I have several.
(NB: Anyone found sigging that will be added to the List).