It’s not very good. It is perhaps the best available Neovim GUI, but VimR has been an unusable mess every time I have tried because it’s trying to be an IDE first and not Vim first.
Before I can take Neovim seriously, I need a Neovim GUI that is exactly what gvim or MacVim provide — not something that adds features I neither want nor need nor can I easily disable.
Granted, it’s been about six months since I’ve used VimR, but I bounce off it every time, because it doesn’t work with the configuration that I have built up trying to match my Vim configuration to the best of my ability.
>Before I can take Neovim seriously, I need a Neovim GUI that is exactly what gvim or MacVim provide — not something that adds features I neither want nor need nor can I easily disable.
Having used MacVim for several years and now using Neovim mostly in the terminal but sometimes VimR, I disagree that it's a mess.
I get wanting to have a common gvim ui/ux across platforms, but I think having a Mac-like or Windows-like ui/ux on those platforms mostly trumps that.
Also, the special features of VimR, like the built-in file browser and Markdown preview can easily be disabled. Using the native rendering of macOS and support for ligatures, for example, is certainly a plus IMHO.
VimR is very good; I've been using it before it started using Neovim as the core [1].
[1]: https://github.com/qvacua/vimr