Are the generic 55KPa/650W cordless vacuums on Amazon any good?

They dominate Amazon's listings and post strong star averages, but across the signals we read they have essentially zero footprint with independent testing labs or established specialist communities. r/VacuumCleaners threads repeatedly flag this entire category as suspicious (no brand history, no parts support, suspect review patterns). Treat the ratings as weak evidence and prefer a brand that high-trust reviewers have actually tested.