Returning to this thread - I invested in the Lowes equipment (IRIS) and ended up returning the whole thing. Too many limitations, lousy software, closed system - which means you can't add anything not sold by Lowes.
I now have a Vera Lite from MiCasaVerde - pretty much the gold standard apparently in home automation for the DIY geek. Took some time to get used to the system, but it is now all working flawlessly.
I have several Schlage Z-Wave door locks, many Z-Wave modules, outlets and dimmers. Combined with my Nest thermostat and Logitech Alert cameras, I'm very happy.
Best of all, a decent size Vera Lite setup for around 15-20 zones can be done for under $1000 - with remote access, security and lots of remotes.