The Strava integration with DayOne is pretty good. I usually manually add content on my activities into DayOne and this certainly helps simplify that.

The integration pulls in your title, notes, and any media, along with a map of the activity. I like that it also integrates with the iOS Journaling Suggestions.

The stats view is rather plain, but I appreciate that given the diversity of potential metrics, this is difficult to display in any other way, certainly for an experimental DayOne Labs feature.