I have been using Alexa for about 9 months now. I went with the Lutron Caseta light switches, as well as Insteon intergration for my older light switches. We have multi zone AC systems with smart Thermostats integratred in 5 rooms. We already had the Honeywell Thermostat that we could talk to. Alexa and the thermostats hasn't been that useful. I switched alot of the thermostats to motion sensors, the rooms are only temp controlled when they are being used.
I started integrating Alexa with my Apex a few weeks ago. Right now I can tell Alexa to turn on the Disco fish and she switches the Radions to Royal Blue to make the tank glow in the dark. I have also set Alexa up to work with my automatic frozen food feeder. I tell Alexa to 'Feed the Fish' and get to show off my new automated feeder.
We have 'Rate of Use' Electric -My electric rates vary by time of day. Fish tank lights don't turn on till 4:30. But if someone comes over during the day. I tell Alexa to Turn on the tank lights. And the tank lights come on.
I have also tried to get Alexa to work with our AV equipment. I went with the Anymote option. But it's been a little too difficult.
My next Alexa project is to integrate her with our home alarm. My wife and I are bad about setting the alarm when we leave. There are some people who have gotten Alexa to know when our phones leave the house to set the alarm, and to turn it off when one of our phones comes back to the house.
Dave B