Great printer for high volume, but make sure and buy quality supplies
Duplexing works well on this machine, but only if you use a high quality paper. You can't get away with the 20 lb copy paper, especially not if it's recycled. On my machine the duplexer tends to jam after two or three pages.
This machine does a great job on cardstock, and can easily accept a higher weight sheet through the multi-purpose tray.
Use the real Xerox toner cartridges, or you won't get adhesion on letterhead, bond, or cardstock.