I have reassigned my workspace switching keys to Super+h, Super+j, Super+k, and Super+l because the arrow keys are too cumbersome. They work perfectly except for Super+l which instead just locks my screen. This key combanation is very convenient for me as I don't need to move either hand from the homerow keys to switch between workspaces.
I'm using 14.04 (64bit). I reassigned my keys using 'All Settings -> Keyboard -> Shortcuts -> Navigation -> Switch to workspace X'.