this is such a YMMV - for me, HF (which includes any 'cheap' abrasive), lasts 1/3rd as long as name brand stuff. If we're talking body abrasives - sandpaper and such - that number is more like HF lasts 25% as long as 3M (or similar). I haven't had many blades come apart, however, if it has - it was pretty much my fault - such as using a cut off wheel as a sanding disk... Or, (and you wouldn't love me if I didn't point this out) there are some people who break anvils in a sandbox - for them, it really doesn't matter the quality.... just sayin'I have been using the HF cutoff wheels for the last 20 years they are cheap and work well. i have tried more expensive ones and they are just more expensive and don't provide extra cutting time. also I have never had one fly apart on me, I do use a guard and full face mask and if i dont have a jacket on I use a leather apron
I just watched the video... none of those are professional-level abrasives. Every one of those are either Home Improvement stores (e.g. Home Depot), or HF...
All of those tests were of Chinesium brands... all of them... probably all made by the same manufacturer. With that said, DeWalt and Milwaukee are starting to fix their abrasives line, so some are actually pretty good.... but lord help you if you get some NOS