I am really happy that it is possible (and really easy) to add Story Cards for Jira issues in a Confluence page. We've used PivotalTracker in the past and when writing design documents in the form of user stories we've manually formatted as cards and manually created stories in PivotalTracker and then copied the story ID and link back into Confluence. While this is now much easier and automatically in sync with Confluence<>Jira I find some room for improvements:
1. Story Cards are not displayed correctly (story ID and especially summary not seen) for Confluence users unless they are also Jira users. This means we'll have to print design documents to e.g. PDF to share with parties who should not be Jira users.
2. Story Cards have a fixed layout and truncates the summary if longer than a certain number of characters. The "Inline" mode does not do this but the Card mode looks so much better. Due to this the design document is not fully readable without hovering over the story to see the full summary. If the status field could be moved further down the layout should have room to show even long summary. For example just above the Preview button - aligned with the priority field.
3. Story Cards have a fixed with - suitable for the narrow "fixed-width" Confluence page layout but when using full-width it would be nice if the cards were also aligned to be full-width as well as giving more room for long summaries.