I don't see this as being useful unless it share's FreeMind's 'strong emphasis on folding'. Otherwise it's basically like a text editor that doesn't let you create documents longer than one page.
I also probably wouldn't consider using it until at a minimum the data is exportable and the data format is future proof.
export to freemind is done, will go live tomorrow. folding is also in the plan. you can make it go live earlier by
- voting directly on http://www.mindmup.com/#vote
- or forking on github and submitting a patch :)
I also probably wouldn't consider using it until at a minimum the data is exportable and the data format is future proof.