How do you manage user feedback?

Using every possible channel. Feedback button in the app, email, Github issues, ... I make it as easy as possible for people to tell me what they want.

> How do you prioritize it?

When multiple people independently request the same thing I start working on it.

> Do you use public roadmaps or keep everything internal?

I think public roadmaps are stupid because I never know how much effort something is ahead of time. It often happens that I realise after starting a project that it is way harder than I thought. I also often realise after some time has passed that something I thought was useful is actually not necessary and I remove it from the roadmap. I don't want people to buy my product expecting feature X and then I strike it.