This stand is very tipsy, especially when you use it with your iPad in portrait mode. This is true for whether your iPad is the iPad air, iPad 2, 3, or 4. The main problem is that the back leg of this compass stand does not lock in place. As you tap away (using your finger or a stylus), the gentle pressure on the screen slowly pushes the entire stand backwards and then eventually the whole thing topples backwards as the entire stand collapses.
The concept of this stand is great, but the actual design of it has significant problems. Don't buy until Twelve South fixes the back leg so that it can lock in place or produces enough resistance that tapping away on the iPad screen will not end up collapsing the stand. Caveat emptor!!!!