The trigger lock button is a right nuisance for lefties such as myself. Right hand users need to reach around to it with the finger tip whereas a lefty pushes the button in every time with the base of the finger unless we can consciously and deliberately avoid it. I've been known to have a trigger locked drill in hand when the bit binds up. Not fun when it's a good sized drill. Let go, duck and pull the plug or risk broken bones. Similar problems exist with most power tools but we southpaw are a cunning type.