I've been streaming on Twitch for about a year, before pausing it. It was a lot of fun as I'm a very talkative person, but in my opinion requires a lot of discipline. Sessions were sometimes subnormally unproductive because I was constantly distracted by the chat and getting pulled into complex conversations. Setting a timer for myself to ignore the chat for 20 minutes helped a bit though.

Pros:

  - meeting new people, sharing ideas
  - if you're lucky and have a lot of experienced people in the chat they can help you out and spot bugs, potential mistakes, etc.

Cons:

  - can be highly distracting and productivity-lowering

There might be more, but those are the most prominent things I can think of right now.