I was pretty excited about LightTable (which has some similar ideas) when it started out, but then Chris Granger went on to another project and LightTable was left hanging. They open-sourced it, but developer uptake was slow initially and there wasn't much progress. Commits/pull requests seem to be better now (2 years on), but e.g. the blog is still very much inactive, and the last release is more than half a year ago.<p>So for me, I'd only try yet another IDE if I have enough confidence that it will live long enough. The commitment of the original team is of course a big factor, but as was seen with LightTable and other projects, that can change quickly. So I would require that either
- it is commercial and has enough investment/backing,
- it is open-sourced and gets enough dev uptake quickly, or
- I believe so much in the concept that I'd try it even if the other two points are not satisfied.<p>Speaking of functionality, however, there isn't any mention of refactoring capacities. To me, that's probably the #1 feature why I'd use an IDE instead of just an editor in the first place. I'd consider the in-place partial debugging display only as a nice add-on, but nothing I would throw out a mature IDE with proper refactoring, search (for definitions, references) and other typical IDE functionality for.