The left click on the MX Master 1 comes up favorably in the long-term accounts, specifically in contrast to the 2, 3, and 3S, which several owners report failing at the left button within one to two years. The MX Master 1 is the benchmark those owners are measuring against, which suggests the original held up better than its successors on that point.
Long-term accounts here are thin. Fifteen total owners across all themes is a small sample, and most of the reliability signal comes from owners who mention the MX Master 1 while describing problems with a different model. That context makes the praise credible but not comprehensive. Polling rate and build quality each drew only three accounts, not enough to say anything firm about how either holds up over time.
Parts named in the 3 accounts that describe a failure
- unspecified/died1 of 3
- battery1 of 3
- mouse1 of 3