We are working hard to duplicate all of the features in SugarCRM Professional, but some features take longer than others. Our current release compares favorably to SugarCRM 4.5 Pro.
One missing feature is a workflow engine. Our plans for workflow are rather ambitious. We are working to integrate with Windows Workflow Foundation.
As for gantt charts, you will have to implement this yourself. We have added support for Silverlight and converted the flash-based graphs. The best part is that we have provided an approach that would make it relatively easy for you to create your own charts.
As for PDF invoices, it is currently possible, but a bit complicated. We currently allow you to import an RDL file and render via the ReportViewer. Our next release aims to provide some samples for printing Quotes, Orders or Invoices.
We currently include the “powered by SugarCRM” because we use their images and style sheets and that is required by their license. Otherwise, there is no real SugarCRM code in SplendidCRM.
The demo site is running our latest 2.1 beta. It is regrettable that you are seeing these errors, but it does help us find bugs before we ship the final build.
On the subject of charts, Visifire has recently released a number of cool Silverlight charts.
http://www.visifire.com/silverlight_charts_gallery.php