Strongly concur. We're remodeling right now, and I just had a conversation with my electrician about this. I purchased eight z-wave dimmers and four slave switches for the house, and he raved to me about how easily the install had gone. He says he normally has to spend about $300 on a high-end Lutron model to get the equivalent functionality. I think I've got a convert here. :)

Smart switches have been a godsend when dealing with an old house with old wiring. We had no lights in our living room -- but there were two small ones controlled by a switch on the second floor. Two bookshelf lights, one smart outlet plug, and a smart switch for the second floor + one controller == turn on the living room lights from the entryway, as FSM intended, without running any new wiring.

I've been a little grumpy about trying to be clever with the smartthings hub, but turning all the lights off at bedtime works, and I won't complain much.