Easy language for Middle English - much more negotiable than the Gawain Poet, even without referring to the quality facing translation - profound influence on the ideas even of modern Scottish nationalism, and particularly the final book with a Scottish noble crusading in Islamic Spain wearing the dead king of Scotland's innards around his neck illustrates how surprisingly connected the medieval world could be. My copy seems to be missing the last 20 lines or so but maybe that's an editorial thing I'm not understanding.
That said, it's very long and I feel I could've read books 1, 5, 13-14 and 20 and got a similar amount out of it. Barbour is very repetitive, operates largely episodically and doesn't seem to have a bigger structure, or any qualms around hypocrisy or historical omission. Doubtless of great interest to Bannockburn fanatics.