The ability to import a report generated by the MS Report Designer is wonderful.  We have no desire to write our own report designer, so being able to import an RDL is critical.  There are even a few third-party designers out there, but it is hard to be Microsoft's free version.

The thing we are missing with printing invoices is the ability to select an invoice template.  We need to create some sort of AJAX drop down so that you can select the the right invoice.