Tbh I have no real complaints. I would eventually like some keyboard shortcuts for moving entire workspaces around without the mouse, but what is there is quite intuitive and I find myself not leaving the keyboard to navigate. The defaults are similar to i3 shortcuts.

I like that they work in tiling and non-tiling mode, and each workspace can be set to either mode at whim.

No issues with stability (which was a problem for me in earlier builds).

I don’t use any of the Cosmic utils, though (text editor, terminal, etc). They seem fine but ymmv.