I'm deep into Google Home with 4 Google Home speakers, a chromecast audio I treat as a speaker and a Lenovo Display speaker. I also have an Echo Dot I got for free. Everything I have was bought on sale.
The reason I got into it is that my wife who is a relative newbie when it comes to computers, etc didn't know how to play music from our stereo system. With Spotify, IHeart Radio, etc., she can give a voice command and get what she wants. I have a speaker group that includes the speakers we listen to the most but can also play music everywhere if I wish.
That was the start. Then, we have TP-Link and Wemo light switches and plugs and a Canary security system that I can control with Alexa and get stats like temperature, humidity, etc. from Google Home. I say "Alexa, Trigger Away Mode" and the alarm is set and "Alexa, Trigger Home Mode" to turn it off.
I have an Insignia smart speaker from Best Buy US that has a digital clock and perpetually displays the temperature outside. That is on my bedroom night table and is my alarm clock.
The Lenovo is in my dining room. I've used it to watch youtube videos but most of the time it displays a photo slideshow. Some people have had problems with the display dying on them but not me. I've had it since last Black Friday.
There are 2 or 3 items that I still would like to implement - a door lock, a Ring or Nest doorbell and a smart thermostat. I have a Nest smoke detector and tried installing a Nest thermostat and found that it's not compatible with our electric baseboard heaters. I ended up selling it on Kijiji. So far every thermostat I've looked into won't work with my heating system. If I install a ring doorbell, the Lenovo will show me who is at the door.
As for the door lock, I'm waiting for good sale on a unit like the August where you change the inside unit but the outside unit remains the same. Living in a condo building, I'm not allowed to change the outside appearance.