It's a well known fact that a large proportion of sites turn off the node preview button. It just doesn't work well. Your unsaved changes don't show and the admin theme is used in place of your site theme - not helpful.
Workflows like that provided by Workbench Moderation give previews that work nicely, but that involves a lot of complexity with revisions and workflow. It really changes the way you (and your nodes, for that matter) work. For the sites out there that don't have something like Workbench Moderation in place, this usually means that there is no accurate...