I'm a technologist, and spend time under desks, inside equipment cabinets, and up in ceilings. A good hands-free light is a great tool to have.
The light itself is very good. Despite only using three AAA cells, the brightest setting provided a lot of light. The small battery also meant it was small and lightweight. The headband, with a loop around and a loop over, was pretty good.
It has three brightness settings, plus a flashing setting, plus "Off". That is all controlled by a single push-button, which cycles through the settings. I found this more annoying than anything else -- I'd rather a simple on/off. I always went for the brightest setting. I think this is more of a gimmick than anything else.
More seriously, it suffers from from cheap construction. Thin plastic. A piece of cosmetic trim broke off almost right away. The lens over the light tended to get loose and fall off easily. And the plastic clips holding the band off broke off after a few months, turning it into a hand-held flashlight.
If it was a more durable design, this would be a great product. As is, it's just not strong enough for real-world use.