Yes
I can't think of a single time it's left a comment on a PR that wasn't a legitimate issue
abound on Hacker News
In the thread “Graphite is joining Cursor”, replying to this comment
Helped: Tuning and ability to query context and run builds.
… They've put a ton of work into tuning it and it shows, the signal-to-noise ratio is excellent. I can't think of a single time it's left a comment on a PR that wasn't a legitimate issue.