The keyboard does not work with most screen protectors. They are too thick, and therefore cause many keystrokes to be missed. If you need to press really hard in order to register keys, then you probably have a screen protector on.
We tested many screen protectors from Zagg and other brands and found this problem. But we finally found a line of screen protectors from Tech Armor that worked with the Touchfire keyboard! They are quite reasonably priced and enable your iPad to be visible when outside.
We now carry Tech Armor screen protectors for all iPads. You can see them here.← Frequently Asked Questions