The Excalibur software is downloadable from Winradio's download pages, working in a demo mode as long as the receiver has not been installed. It has a test signal on 15 MHz, as you can see from the screendump.
The initial impression of the GUI is quite good, although they try to put a lot of information into limited space. A good thing is that the program window is resizeable and that several "skins" are available.
The RF recording feature suffers from the same problem as the Perseus: No scheduled recordings. Third party software solved the problem for the Perseus, and I hope that a Winradio plugin, or a software update, will solve the problem for the Excalibur too. There is in fact a very able scheduler in the program, but it only handles audio recordings.
There are some really nice features once you dig a bit deeper into the software. I hope to see the receiver some time next week.