I have a house with nearly 40 light switches. Being able to turn groups of them on and off in coordination is very nice. Hitting one button and having all of th

I have a house with nearly 40 light switches. Being able to turn groups of them on and off in coordination is very nice. Hitting one button and having all of the lights desired for dinner guests is cool. Turning off the lights in the TV room, and having them automatically come back on when I pause the movie or turn off the TV is convenient. Switching off all the lights in the house when I go to bed (rather than trudging back downstairs because I forgot to turn off a single light in the kitchen) is really handy. None of this stuff is life-changing, but it's a very nice convenience and I find it well worth the (really minor) trouble. Though I'm using a zwave-based system, not wifi switches. Edit: Also, crucially, our system works "as expected" if you don't know anything about it. I've never had a guest surprised or baffled by it, and it works fine if the network and/or controller is down. In some cases a single switch may turn on more than one light, but not in a weird or surprising way -- generally closer to "why didn't they just wire it that way in the first place?"