I was also very frustrated when my old HAI touchscreen quit and I attempted to replace with the OT7. Returned it within a week, as it was just not configurable enough. I absolutely LOVE my HAI OmniPro II. It does the security, hvac, lighting(X-10), macros, and really simple messages (trash night). However I have other devices that I also want to integrate into one central touchscreen, IP cameras, Home Theater, and a bunch of other handy household stuff.
After much research, trials of various apps, and some very good insights from this forum, I set out to build a custom solution that I intend to share via open source really soon. I am a Java developer so Android made sense for me. Yes, I looked at iRule and OpenRemote, but they aren't there yet, for Android or for my needs.
I purchased the Nexus 7 (2013), an inductive charger, and plan to use Dockem wall mount clips. Total cost less than $250. Since it is not advised to charge the device continually, the charger will be plugged into an HAI controlled outlet so I can program charging frequency and duration. Outlet and all wires will be completely hidden and device can be easily removed from wall for home theater use, The tablet solution isn't perfect, but I wasn't ready to tackle the hardware work to implement a Raspberry PI solution, and for the price, Hi def screen, sound, WIFI, front facing camera and the Android OS!! I have it launch in landscape, fullscreen, and am working to keep users from exiting the app. I also want to implement a dimming, or screen saver.
I am almost ready for beta testing the HAI stuff. Still working the Home Theater integration. No intent to sell, but willing to share and collaborate. Please see the gallery under my profile for screen shots and photos. Pretty sure you can message me via my profile as well.