I love it! I could see myself using it to document event storming sessions, impact maps, Wardley maps, etc.
That said, I found it a little buggy at the moment. A couple of bugs I noticed were that scrolling too quickly to the right produced an error, and the 'flag' box rendered some of the text outside of the box. A tiny usability improvement for me would be if the buttons behaved more like Photoshop or Omnigraffle, where I can select the tool and then apply it on the canvas, rather than dragging the tool to the canvas. I'd also like to try out all the different tools before paying - the checklist box, for example.
Not to take away from OPs product announcement at all but recently I ran a remote event storming workshop using https://miro.com/ with a standard "whiteboard" and their regular postits feature.
The sizing and color options, the simple way some small things in the UX works to make grabbing a postit fast, and coloring it correctly was really, really surprisingly nice
That said, I found it a little buggy at the moment. A couple of bugs I noticed were that scrolling too quickly to the right produced an error, and the 'flag' box rendered some of the text outside of the box. A tiny usability improvement for me would be if the buttons behaved more like Photoshop or Omnigraffle, where I can select the tool and then apply it on the canvas, rather than dragging the tool to the canvas. I'd also like to try out all the different tools before paying - the checklist box, for example.