If you are just getting started and are looking for good switches to buy consider going with Zigbee over Z-wave. I have hundreds of Z-wave switches in multiple locations and you really have to baby the network to get it right. I have recently been putting in Zigbee switches and building out Zigbee networks. I have cut my setup time in half and increased the reliability. My reference is based on large installations only.
Here are the issues with Z-wave
-With Z-wave you have center the hub in the location and avoid more then 2 hops.
-Sometimes I have to move the hub beside a switch to get it to work right on setup or I have to unlink it and link it again a few times.
-Sometimes a switch on the fringe areas will have long delays in reacting (usually does not happen if you follow the two hop rule which is not always possible)
-You have run "Repair Network" a few times during installations and/or wait for your network to "self repair".
-If a switch fails it really messes up your network
None of this happens with Zigbee. All I have to do is setup the switches and they always seem to work. If there is a failure only the switch that fails is the problem.
I will usually bring a few plugin sockets with me. Set them up first and spread them around a large location. Make sure I can talk to all of them and then get to setting up the switches. When I am done, I will remove the Zigbee Plug sockets and the I am off to a new location. I have found that I have cut my time in half. I group up all of the Zigbee devices and you now get an instant on/off.
If you are starting out a new network then consider Zigbee over Z-wave because the switches are all the same price. I personally use exclusively GE Enbrighten switches. They are cheap, can take a full 1800 watt load, easy to install and very reliable.