My company needed a chart control that could perform well under a heavy load - potentially thousands of points with multiple points added each second. I spent a lot of hours comparing different chart controls available, both free and licensed - Syncfusion had the only chard that didn't blow up the CPU usage in the test app. Since then we have purchased the Syncfusion Essential Studio and were able to easily customize the chart to our application's needs. In addition, the support is superb - if I can't find an answer through their forums or FAQ, I open up a support thread and get a quick response from their team.