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I'm no developer but I've been using kakoune for editing for the past month or two and the experience is very good. Mawww has been working on the editor for the past 3 years so it's in a pretty good shape. Programming-wise there's syntax highlighting for many languages already, check out https://github.com/mawww/kakoune/tree/master/rc for a list. Adding a basic syntax highlighter is simple enough as well. IDE-wise you'll get the best experience when writing c/c++ I think as the author does that and put a lot of effort in it running smoothly. Editing-wise I like the features more than vim's or emacs'. Working with multiple selections is very effective, fast and fun. Stability-wise I don't think you have to worry too much anymore, there's occasional bugs that are fixed very quickly and the key bindings are pretty much set (there's a minor change every now and then when implementing new bindings but nothing major). Customizing-wise there's enough options and they are quite well thought out. There's no vimscript or elisp, for the design choices check out https://github.com/mawww/kakoune/blob/master/doc/design.asci... . The author is also very responsive to suggestions and is implementing features the users are asking for (if they make sense and conform to the design of course).