I do want to mention that I ran into a couple of glitches (as I would expect with any such brand-new product). Somehow in using the Find function I got a freeze where I had to Force Quit. Also, I wish that it would indicate that it got matches and how many matches it found when I typed into the search box.
To start things off, I imported from Safari. It looks like it create a “workspace” for every Safari page. But I had so many Safari pages open that the workspace for the tutorial page had scrolled so far down the list that it was off the page. So that confused me for a while when doing the tutorial. (In the end I closed all the workspaces that had come from Safari pages.)
I think the workspace-specific todos is a really nice feature with potential to be quite useful.