I believe the multiple os compatibility is a new feature. I had the previous version and I don't remember it working on a PC... I could be wrong...
My company recently purchased this for me. I can now service computers across the office right from the convenience of my own office. It's very cool.
I used to use Timbuktu of course, which worked much better for WAN connections. I don't think Remote Desktop is recommended for WAN connections regardless of bandwidth.
I have been having one reoccuring issue with the program however, I cannot seem to generate reports from client machines. I keep getting a "Database error". It doesn't seem to matter what machines I attempt this report on (G3s, G4s and G5s all seem to be effected). I've also installed the administration software on my laptop, with no luck.