Huge step down from Hangouts. Not as simple and easy to use. Cannot select more than 1 photo at a time - very inefficient to share files one at time manually (scrolling through the gallery each time). The integration into Gmail is also tedious, now I have both Gmail chat and chat app. When sharing links, the chat app doesn't even show up right away. It's a huge step back in terms of simple UX and ease of use. Disappointed.