Great job! Impressive to see an open source project to pick a fight with established software packages like Tableau. I used many BI packages in my life (only fe

Great job! Impressive to see an open source project to pick a fight with established software packages like Tableau. I used many BI packages in my life (only few of them for longer than a while) and consider my self an intermediate D3 programmer. Some feedback if you need it: the UI seems very slow on Chrome, and I don't find it intuitive - there's a lot of dragging and dropping from various places to establish a simple data vis. Ideally you'd like to see what is available, choose it and later play to tweak it, not having to do lots of configuration upfront. Perhaps you could default your tool to do a line chart (or some other kind of early visual feedback ) so the user knows he's on the right track from the beginning?