Trying to chat with others I find difficult. Other services that use your number will attempt to tell others you're trying to send them a message if they're not signed up yet. Allo? Not so much. In fact many of my techie friends, two of which worked at Google, are not even on it and it doesn't work with any of Google's existing chat apps. So I have to go out of my way to try to get friends on it.

Nope. Too much friction. Gave up. The AI is okay but didn't seem much better than, say, Google Now. So I didn't really understand why I would even use it.

Dou is kinda the same way and I really wish they would have combined them. You could even let the AI work in the video mode and if it overheats something it can add information.