I'm a professional handyman and home improvement contractor. It's indispensable to me for working in crawlspaces, houses in between tenants with no electricity (a generator is often way overkill), and in rooms where I have to turn off the breaker for one reason or another (working on a light fixture is an obvious one.) Many contractors use flashlights, but it seems a no brainer to me to use a light that is both hands free and directed by my sight.
The Kobalt Hypercoil works well as a standalone flashlight in the sense that it can be hands free and be left aimed anywhere, but there are obviously different pros and cons to that approach.
I currently use the Coast HL4 which I like because of the bright light, adjustable angle, and simple on/off switch (some have multiple use switches that you have to toggle through - hi, lo, strobe, red - I have no time for all that.) The HL4 has a separate red button, but I don't ever use red. I'm soon going to switch to the HL7, which has brighter light, dimmer switch, and adjustable beam. The rated battery life isn't high on hi setting, but I'll be looking into using NiMH rechargeables with it. The HL4 has an additional top band and I'm not sure how much that helps keep it in place on my head. The HL7 does not have the top band, but the HL4 has exposed wires which sometimes get tangled, and I look forward to the hidden wires of the HL7.