This looks very useful for what we need to do next at work. However, lately I've been avoiding all "layer on top of D3" libraries, in favor of understanding how

This looks very useful for what we need to do next at work. However, lately I've been avoiding all "layer on top of D3" libraries, in favor of understanding how to do the thing myself in D3, and just doing it that way. Sure, it's sometimes a significantly longer of a solution (300 lines vs 20), but the ability to completely change/improve any aspect of it without needing to switch libraries or dig into the library's source code or learn a new plugin system, this makes it worth the extra lines of code.