Spot Weld Cutters

All right.....who makes a good spot weld cutter? I just bought one yesterday from my supply store that was supposed to be the bee's knees. The very f'ing first weld I tried to drill through broke the tip. That sure was worth the $25. So I grabbed the cheap one I had in my tool box and almost got all of the welds cut through on the panel I was working on when it denuded the cutter. This of course happened just before all the local auto parts stores closed. Grrrr