Asked — Edited
Looks like a neat idea, the WiFi unit is small. The iOS and Android app looks interesting.
The EZB(4) can do a lot more using a UART port and some two way conversation with the Roomba 500 through 800 models
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Also, the new Mono library is compatible with Xamarin if you want to create an app in c#. Using Xamarin.Forms makes it cross platform, as well. Meaning it will run on Windows Mobile, iOS and Android - all in one build. For $99, it is too much money. I would pay $19 for that - considering it's only a $4 wifi module