Grinders.... Let me see... Oh yeah! I have had the privilege to use many many many grinders. HF grinders never last me very long. I guess it is because I am a welder and really put them to work. My choice in grinders is the DeWalt 10 Amp 4 1/2" unit. I put it through hell. Once a year I take it to a local shop where they put new brushes, cord, and give it a complete once over for $50. I go through an HF grinder in 3 months or less. That's $80 a year plus travel time and gas to go to HF. I have had my DeWalt for 3 years now. By my calculations, I have saved $15 so far. $125 to buy, $100 for the two subsiquent rebuilds, total $225. In the same amount of time, I would have gone through 12 of the $20 units. One thing is garuanteed, no one is going to take as much care of a tool as the person who paid for it.

P.S. You will find Norton grinder discs last 2 to 3 times longer than imported wheels.