With limited use so far, it's intuitive, fast, easy to use, and feature-rich. It is a standalone app, so no, it doesn't open within Sheets or another Google app, for use within those interfaces. But at the least, you can Export your work in a variety of formats and just paste it into your document.

good

Really bad quality when embedding a draw.io in sheets. When enlarging the embedded picture you only see big dots.

Does NOT work with Google Sheets

Can't get it to work. Trying to imbed google sheet from draw.io gives me errors or takes me back to the marketplace.

I keep getting an error saying im not authorized to add the add on