Also available in an outdoor configuration
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Pros
Pro Doesn't block other outlets
Most other smart switches block other outlets, however because this one is designed to sit horizontally instead of vertically, it won't block any other outlets giving you full access.
Pro RGB nightlight adds some personalization
The bar on the front of the switch is actually a RGB light, which can be configured to any color, at varying brightness as well. It isn't the brightest, but because most plugs are near the floor it provides sufficient lighting for night-time use or can add to accent lighting for a more whole-room effect.
Pro HomeKit enabled
HomeKit is deeply integrated within the iOS ecosystem, including Siri. You can place multiple different devices into a single 'scene' and have them all activate with a singe voice action.
Pro Useful companion app
The app is laid out simply, which makes using it a pleasure. It's layout is clearly designed to put the controls - the most important part of the app - front and center.
Pro Allows information which can lead to lower energy bills
While the energy reports aren't as detailed as other switches, they are still detailed enough to show where you can save some power costs. This is a useful feature, as it can save you money in the long-run and even pay itself off.
Cons
Con HomeKit only
The iDevices Switch doesn't support any other smart home systems. While not an issue if this is your first smart home product, it won't play well down the road if you purchase any Wink, WeMo, Nest, or other non-HomeKit devices.
Con iOS only
There is no Android or Windows Phone support. This could be a deal-breaker if other inhabitants of the house use an Android, Windows Phone, or BlackBerry OS device.
Con On/off only - no dimming
This switch lacks the ability to dim lights plugged into it. Dimming is not only useful to control the brightness in the room, but can also act to save electricity.