How long do steam mops typically last?

Durability is a common pain point in the candidate data. r/VacuumCleaners threads on the Bissell SpinWave flag reports of units failing within months, and r/CleaningTips has complaints about Black+Decker units not heating. Long-time owners of the Shark S3501 and S1000 report multi-year service life. Buying from retailers with strong return policies is a recurring recommendation.