I was using the less costly (didnt know there was an alternative at the time) spot weld cutters for quite some time until I discovered the Blair 11094 spot weld cutter.
The 11000 series Blair will cut spot welds in a fraction of the time it takes with the older double ended type cutter. I was so impressed with the 11094 I gathered up all of my other spot weld cutters (some of which the blades were unused) and promptly pitched them in the scrap metal container.
Best of all- MADE IN THE USA Blair
See cutter at upper left side of page.