It's easy for your students. The keyboard's soft, responsive touch is easy for students. It gives them back the instant kinetic tactile feedback that comes only with a real, full-sized keyboard.
It's easy for teachers. You can spend more of your time teaching and less on troubleshooting Bluetooth connections.
It's secure for testing. If you've worked in a school testing environment, you're aware that a direct wired connection is inherently secure from eaves dropping.