Does anybody use plugins for both Confluence and Jira?

Mockups for Jira makes a lot of sense to me for somebody who uses Jira but does not use Confluence. Since we have both, I'm tempted to get Mockups for Jira also (I already bought Mockups for Confluence). But I wonder how much benefit I'll get having it for both. Is anybody using both products? If so, please explain why it makes sense to have both.

I realize there's a discount if you buy both, so that's good to know, in case we decide to go that way.