I feel I did not understand the main advantages of this notebook aside from the AI integration. I don't understand how "start-up" time is a cost; I have a Jupyter server running at all times and use it as a scratch-pad throughout the day, so it is always available.
I don't understand the "modern command palette". As far as I can tell all the commands are available to regular Jupyter Labs, and either way I always use hotkeys for them.
The code formatting using black isn't bad, but notebooks are for scratchy ideas, not real code. If I'm at the point of formatting code, it's going in an actual IDE. I'd even argue providing formatting inside of a notebook encourages bad habits for scientists, who prefer to stay entirely within a notebook, but are then sometimes unable to reproduce their results.
I don't see the advantage of the copy-paste; I can copy paste directly from Labs to Slack/online editing pages, and certain Latex typesetters.
Pros: it looks pretty, the site has nice demo videos (in terms of quality; I didn't understand the content).
I want to like this but I don't see any benefits for a power user except for the AI integration; if AI is the only selling point then I prefer to get it differently.