One of the things I really like and would be a definite pro for the software is its compatibility. It helps bring new life to older systems when they're not in use. My trusty HP Jornada 545 can now be an extra small monitor (I have 2 regular monitors as well), which I tend to use for SSH, notepad, IRC, a mini web browser, media player or virtual TV remote (I have an IR sender on my PC). Really useful application, I only wish they could fix connecting two PDAs up to it - they both connect, but both show the same display at the moment
One thing that is a little frustrating is a few bugs, like if it is sent a lot of data over a short period continously, the display freezes until you change an option every now and again