Both of my parents have an Amazon Echo (Alexa), and I think it's super cool. I would never get one myself because I truly feel as though they constantly monitor what I'm saying and I am not comfortable with that. It's not like I'm doing anything illegal or vocalizing threads, but I don't like the thoughts of something/someone constantly listening.
Although... I would really like to get a Google Home to control my lights and music. That'd be really cool.