There are 4 buttons on the Tap - one large main one which covers the entire front, and then 3 smaller buttons for additional scenes which can be custom configured through the app. Together, this switch allows for control of 4 separate scenes.
Because the kinetic energy from pressing the switch is used to power the switch itself, you really need to push the button hard in order to activate it, requiring much more force than regular switches.
When mounted on the wall, the switch looks futuristic. However, once you remove the switch the mount itself is left exposed. It looks like a smoke detector mount, except instead of hiding away on the ceiling it's generally going to be exposed on a highly visible wall.
Once all setup, you can turn off lights in each room and also each zone. For example, you could turn on just your bedroom lights, or the bedroom as well as any other room upstairs if you've included the bedroom in the upstairs zone.
This switch only controls two lights at a time which need to be plugged into the switch. This also means that the switch itself needs to be plugged into a wall socket, which are typically low to the ground making the wall switch harder to reach.
If you are away from home and want to turn on lights, or check to see if any lights are on, you will need an Apple TV. If you already have one, this isn't a big deal however for many out there this will add another device and another initial startup cost.