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I used Swiss or Swiss 6 since 1998 and like the Quantums better. They're super fast and I have to maintain them less. I've never had a single jammed bearing or issue with them. Everyone that I have gaslit into trying them has not switched back to what they were on before including Swiss. Of course, Swiss are still amazing bearings and you're really in the margins with any of these choices, but I feel Quantum has one upped Bones.
While this may be the case for you mr. Lebowski, the QC seems to be minimal at best as many slap posters have not had such stellar experiences. For the $$ regular ol swiss keeps rolling
Quantum had a few early QC issues and many of the "issues" with them are from people running them shieldless when specifically advised by the company not to. So, I can't really consider that to be in line with your statement. There is far, far more praise for the product and good success stories. People on Slap went out of their way to shit on the company when they started and were biased towards complaining.
I had some of those early bearings which felt a bit slow. They came overlubed and Quantum sent me new bearings. My first set of bearings are the guide bearings in my industrial bandsaw now actually. The replacement Atoms Quantum sent me in 2020 are my current bearings. I have cleaned lubed them 6 total times since then. My prior set of Swiss 6 lasted about a year before 2 bearings developed notchiness that never went away and later was revealed to be a cracked cage, which is a common breaking point for them noted in threads on this forum. I was cleaning them on a much more frequent basis despite skating in a place that has less dust/fine sand.
Every product can and will break. There is no evidence to say that Quantum or Bones are more susceptible to issues than other bearings, but since they are more expensive people talk about them more.