Since this comment thread involved a lot of people talking about their smart devices, I’ll just put out a PSA: don’t bother with cheaper zwave light switches and dimmers :) if you’re looking for a high quality decent price option, just get Lutron Caseta. Or if you want higher end / better style, get Lutron’s RA 2 Select hub (basically Caseta++) for $100 more and then you can use Caseta dimmers or higher end Maestro d…
Lutron devices don't form a mesh network, though? And a limit of only one range extender. And only 50 devices? http://www.casetawireless.com/Pages/faqs.aspx I'll stick with Z-Wave, even though it's not perfect. And it's true that there's some terrible Z-Wave hardware but there's also better (and pricier) gear.
After that, you go with RadioRA 2 and an installer, which is no fun for DIY.