I brought a cheapo set from a pawn shop. Its ok, helps save time undoing the screws from hard drives etc.
A couple of things I'd look for is, that the screwdriver bit is 'loose' when its not turnng around.
That's so that when you stab the bit into the screw, there's enough slop so the bit seats into the screw head.
Otherwise, when you pull the trigger, you can often strip out the screws head.
That there's some sort of speed control in the trigger, the harder you squeeze it, the faster it goes.
Or once it starts turning around, you are doing nothing, just looking at a slowly unwinding screw...
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