I have been working with this code for a couple of months. Quite simply, this is brilliant work. The use of design patterns, event routing, control templates is impressive and admirable. The product is focused on cartesian xy display (as
a technical chart should be). For business graphics like bars and pies you will be better served by other options.
The performance is amazing.
It is my sincere hope that the next generation of this product targets both silverlight and wpf.
There was a bit of a learning curve and there is currently not much architectural overview material - you will have to discover from the excellent sample code, forum discussions, and chart source what you need there.
The authors of this project should be proud of this accomplishment. It is a truly elegant achievement :)