Gesture Sensors

I've been looking at the APDS-9960 and Hover Labs Multiple Gestures sensors. I'm wondering if anyone has used them. How well do they work?

The Hover detects a few more actions but requires that the whole part be visible. How much of the APDS-9960 needs to be exposed to work?

How well do they work?

The APDS-9960 works well but has a limited set of gestures. If you can live with that...

How much of the APDS-9960 needs to be exposed to work?

The datahsheet specifies what mask you can apply to still let it work. If you put some glass in front of it, use acrylic glass, quartz glass filters out too much of the infrared signal. You'll have to calibrate the sensor if you put it behind some kind of glass as the refractive index is relevant for the gesture detection.