* Automatic log cleanup to a desired storage size.

* Automatic compression, transparent decompression.

* Filtering by date, or boot number.

* Log shipping, ability to see interleaved logs from multiple machines.

* Microsecond precision for timestamps, multiple timestamp types and output formats.

* Output in JSON or multiple other formats, for trivial parsing.

* Cursors, for easily continuing parsing where you left off.

* Applications can log custom fields. No need to extract data from strings then.

* Captures logs that happen inside initramfs before / is mounted.

* Docker containers can log to the host's journald

It's pretty darn nice, really.