It’s a neat technical achievement, but I don’t see the utility. My worst nightmare is being forced to code in random locations, same editor be damned. So the “access your editor from any browser!” isn’t terribly enticing.
The choice to use column view rather than tree is interesting, but for me, flawed. I can’t stand column view. It’s like a tree except you can only view a single branch at a time. What’s the point of that?
I do like their color theme though.