4-1/4" angle grinder - failed, but i'd buy another.
https://www.harborfreight.com/4-1-2-half-inch-angle-grinder-with-paddle-switch-65519.html
I bought this grinder last year, on sale for $19.95. I've used the daylights out of it. It's worked flawlessly until a couple days ago. I was using it to clean an old anvil and working it very hard. It got so hot I could barely hold it. Eventually it started to cut out and quit. I should have let it cool down, but didn't. The autopsy revealed that one of the plastic brush holders had overheated and disintegrated.
So it failed, but I have to take a lot of blame for it. But if it comes on sale for $19.95 again, i'll probably pick up another. Hard to beat at that price.