I have a Makita I bought over 15 yrs ago. Honestly, I don't use it 8 hrs a day, everyday, but I've used it hard, dropped it more than I care to admit, set it on fire once (my fault, not the grinder ) , and it got soaked in the rain a couple of times. Still no issues. Never had a problem bumping the switch off either, if anything, the placement has enabled me to turn it off quickly when needed.