We have been recommending and installing iPad minis in iPort controlmount docks for our customers. Yes, there are pros and cons to both, but I usually distill it to this: for the same money one can have a touchscreen with limited, albeit dedicated hardware, or a much prettier and more capable iPad that allows users to control HAI via Space, AND lets them check email, weather, search the web, and a thousand other things as well. The functionality is just orders of magnitude higher in an iPad, plus it looks better, and I would argue is far less flakey than the OT7. With the ever-improving Siri integration, a demo of the ability to say, "Hey Siri, what's the weather (or anything else)?" - hands-free in the room where the touchscreen is located is usually enough "wow" factor that clients opt for the iPad over the OT7.
Is Space could push status notifications and camera pops, the decision would be an utter no-brainer. Until then, the ability to have cameras pop (which the developer informs me IS possible - so I need to research this better/further) and the ability to see the red of green LED to indicate security status are really the only compelling things in favour of the OT7 right now.
Oh, and the ability to set the background wallpaper in Space (e.g., with a photo of the house, or even that specific room) is HIGHLY attractive!