Maybe I've just got a naturally calibrated eyeball in that regard, or maybe it's just the 15+ years of shop experience (largely split between building small wooden boats, doing theatre stagecraft, and making tooling/pushers/jigs for a short-run thermoforming company).

@willyolio:
It's not the idea that a human can estimate better than they can measure with a tool. It's the fact that if you're paying attention to the level, you're _NOT_ paying attention to the screw, and you will increase the chances that you'll slip the bit and punch a hole in whatever you're trying to attach. It's also partly about knowing how to pick your tools. With a pistol-grip screwgun, you can center your force directly over the shaft of the drive system. With one of those horrid T-grip handles, you've got off-center leverage, which results in tilt when used by inexperienced or tired individuals. T-grip screwguns are designed to be ergonomically balanced when you're standing there trying to look like you know what you're doing, but they are the cause of many of the weekend handyman's problems in the proper sinking of screws. That and an often inflated sense of expertise. Learn how to do the job right, and you shouldn't ever need crutch tools like this. Heck, learn how to do the job right, and you wouldn't even consider buying this thing, even if it didn't have the screw-holder.

The LED light is about the only useful aspect of this design, but placing an angled beam on the battery gives you a better field of illumination, as well as keeping the light out of harm's way (that is, assuming you have a real battery pack, and not one of those under-powered in-the-handle designs).

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