Funny you should mention that. The welding shop I worked in 15 years ago had big 9" Makitas that I used to grind off the burrs where the welders had attached bars to pull the sheet steel into place before welding up the luggers, roll-offs and trash containers they were building. They had the locks removed from them too, for safety reasons. I ran those grinders for 10hrs a night and had to hold the switch on the whole time. I remember waking up with my index and middle finger snapped tight shut to my palm and having to pull them away from my hand with my other hand.
I did end up with a lot of respect for Makita tools though, after watching the pounding they took.