I routinely need to take a live site down to a local server, modify it, push it to a staging server, then to a live site. Often the livesite is runing along in the meantime, and new content is being posted while the new version is being developed.

So before the new version of the site is finally moved to the live server, the latest content need to be merged from the 'old' live site.

This process is always a pain, because the WP Importer is not solid. Impoted posts loose their featured images, and images in the content link to the old site. The media library doesn't show the images that the importer actually do import into the uploads folder.

We need a better export/import plugin, and I'd be happy to pay for it.