I think we should all follow
@westward10 about protecting your eyes, ears, hands, and the rest of your body depending on what tools you are using and what situation you are in. For example, a simple hard-hat has saved me from some nasty gashes to the head from the nails holding slates on in an attic, etc.
But for the original discussion my most recent best-buy has been an impact driver:
M18 FUEL™ ¼″ Hex impact driver. Higher power efficiency under load - outstanding torque of 226 Nm. Faster driving speed vs. previous model - up to 3600 rpm and 4300 ipm.
uk.milwaukeetool.eu
I actually bought the FPP2A2-502X kit with that, a more conventional battery drill, charger, and two 5.0Ah batteries. But it really has been that driver along with the hex-shank drill bits that has been most useful
by far.
A word of warning though: even on its minimum setting and making use of the variable-rate trigger it will
easily chew up smaller screws, and a moment of carelessness with it set on mid-speed sheared a M6 roofing bolt on some cable tray I was assembling.
But only a complete muppet would use it on electrical terminals? Really?