I keep reading about it on the Internet, but in a lot of years, going though a pack or more a week....not one has ever "exploded" not even when I have bound them up in a cut and chunked them. Perhaps its because Im smart enough to nut continue using one after the cut off tool got dropped or kicked and the wheel damaged...perhaps Im just the only one that posts to the Internet its never happened to...
They do not last as long as good 3M cut off wheels, nor do they cut as aggressively. But since they are 1/10 the cost the higher wear out rate is more then covered. So for now, I'll continue using a mix of 3M when I need slower ware rate or faster cutting, and cheapskates ones the rest of the time
You can find Internet posts about grinding wheels exploding as well, in 40 years try as I might by abusing when I did not know better as a kid, and now using them at or past the design intent sometimes and never had one do that either.
Hard to believe I know, the Internet says they should blow up, take an eye out, make my dog pregnant and cause paint to peel on solid stone thats never had paint.