I wrote a little app recently to test out live-view. It was my first time really working with it, though I've been writing elixir for years. https://gif.energy

Didn't really have any issues. There were maybe one or two gotchas but they were explained clearly by the docs (appending vs updating elements) and I was able to get it sorted easily. That whole app took a couple days, but more than half the time was wasted on iOS not supporting mp4 and webm formats for the animated shots in the chat messages. Unfortunately, liveview does not fix Apple's stupid walled garden.

Overall it was a great way to minimize the javascript involved. It doesn't make sense for certain types of apps, but it really adds a ton of value and saves a lot of time when the use case is right. And it performs really well. Loading and rendering a chatroom full of messages (with animated gifs in each message) makes a couple requests and happens in less than a second.

And combined with phoenix presence it was like...5 lines of code to add realtime online/offline statuses for users. Super cool.