Best DA! I had Dewalt DAs and they were good for a week. This grinder is the best and very very fast. It's also slim and light. I use mine to finish the metal and remove the scratches left by the grinders and then basically freeze the metal once all the scratches are gone. It doesn't seem to need as much oil as my other every hour. I oil mine 3 times a day and it lasts like a champ. That cuts my working hours by at least half.