Actually, my husband brought the topic up over the weekend while we were driving into the city for an evening of theatre.
"If we bought an Ipad, could we use it for anything?", he asked. Some of his work buddies bought Ipads in the heat of the fanboi frenzy - but admit that they're now gathering dust rather than being used.
The answer for us seemed to be that if there were an app that would interface to our Z-wave home automation system - we'd get a tablet in a minute. (I suggested that a 7" tablet would be more convenient, but he wants a 10" or so that he could use without his glasses.)
Android or IOS would be a non-issue - we'd be buying a coffee table app to control the house. The app would drive the purchase. (The Z-wave controller is USB-based, so the Ipad would be useless as a controller - but it could be a remote terminal to control the controller running on our Windows Server 2003 home server system.)