Serial Graph Tool

The Arduino Serial Graph Tool allows users to plot up to eight channels in real time. It is a plug in shield that connects the SPI bus of the Arduino to a Windows application. Easily build a complete Real Time Data Acquisition System.

I'm sure it would be pointless for me to pursue this stuff as I am only interested in logging numerical data over a given period, but I have to admit to a vicarious interest. So has anybody actually used this, and can point up to the differences and advantages compared with simply using PLX-DAQ?