So I am now confused. We use Google Hangouts, ah, sorry now Meetings, with a Chrome box. Hows does this fit in? Do I need this and my current setup or can this

So I am now confused. We use Google Hangouts, ah, sorry now Meetings, with a Chrome box. Hows does this fit in? Do I need this and my current setup or can this take the place of the current system? It was not clear at all from the product page. Google sometimes seems like they toss stuff against a wall to see what sticks without figuring out how it all goes together.