Is the M1 Caliber actually accurate for miter saw cuts?

Finish Carpentry
Miter Saw

The doubt is reasonable: a wheel-driven measurement sounds like something that should drift over a day of cuts. Zeroed against the blade and checked against a finished piece, the M1 Caliber's displayed length and the cut length agree, because the zero already carries the blade width. That is the test worth running on any digital stop before you trust a trim package to it.

How the accuracy was checked

A wheel-driven reading sounds like it drifts
Zeroed against the saw blade
Checked against an actual cut piece
Displayed length matches finished length
The zero already carries blade width

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The doubt is fair, so it is worth checking rather than claiming. The M1 reads a wheel rather than a blade, which sounds like it should drift. Zeroed against the saw blade and checked against a cut piece, the displayed length and the finished length agree, because the zero already accounts for blade width.