I subscribed to Mikael's patreon when Glyphin first came out, and here's my experience using it. As a text editor in alpha stage, Glyphin inevitably lacks some of the features that other editors, such as vim, have. However, the author is very responsive to any emails I sent him on bug report and feature requests, and pushes out the fixes and improvements quickly. Here's a quick overview of Glyphin at its current stage.
The good parts:
Glyphin feels modern. It's a text editor that has both good user experience and performance. Its colorscheme and syntax higlighting can be customized, and the change is immediate; I didn't have to call a command like :so% or "eval-buffer", the changes apply right when I save the customization files.
The bad parts:
Glyphin lacks ways to navigate through text quickly with a keyboard. I had to use mouse to do most of the operations, such as splitting pane, switching pane, and so on. I am used to editing and moving using keyboard only, so I can't switch to Glyphin yet until that feature is added. Project mechanism is nice, but editing everything that's not already a Glyphin project is quite tedious, as the editor accept absolute path for opening files if the file is not in a project.