Keyway details are limited in the reviews, but keyed models can be rekeyed and accept standard backup keys; key-free variants remove the key cylinder entirely as a potential failure or attack point.
The mechanical keyway is a useful fallback, but one review flags odd cylinder/keyway design choices; overall it is treated as a backup rather than the primary daily-access method.
Re-keying is a common pain point: several reviewers say the cylinder and pins are nonstandard or hard to swap, making matching existing house keys difficult without a locksmith-level workaround.