I was actually playing around with the voice commands, you do have to setup loads of Google Apps, like Google search and Maps etc and give it permission to everything but it does work... I highly recommend using Nova launcher as it places the Mic search option right on the home screen.... which launches Google search... "Ok Google" and you're off.... I'm not sure how to get it to recognise OK Google without first having started the search app... Anyway some of my favourite things to ask for....
Take me home.... (Starts maps navigation)
Play some music (starts Google music and tries to play music)
Order Pizza (finds the nearest dominos)
What is iPhone (reads out definition of an iphone)