We wanted to have the latest newsletter show on the site to entice more people to sign up. It works great, the settings are easy, and am very happy you're able to control the size of it all.
Two small gripes, though. 1) When only showing one newsletter at a time and clicking Show More it sometimes doesn't work. 2) We have a long, events based newsletter with lots of imagery that changes weekly so the height constraint was a problem for us. We changed the code in the plugin to allow the height to go up to 3000px, which may be the reason the issue is happening with #1.
UPDATE: I changed the container DIV to have "overflow:scroll;" so when clicking More the older campaigns are visible when scrolling down. Worked out well.
Other than that, this plugin is awesome and I highly recommend!