Yes, although the thing on my desk is just an x-term & media player, so "desktop system" doesn't mean that much...

Mostly video performance (1080 vid stuttered badly, while it plays fine on the same machine under linux.) & compatability. (Not that I want to run a browser on my x-term, but it would be nice to have as a fallback option. Can't install anything recent.) Oh, and extended attributes in the filesystem. I REALLY like being able to add name=val tags to a file. It's immensely useful. That might be my favorite feature of linux? Funny.

Also, I was in the midst of switching from Solaris to Linux on my server, so it just seemed like a good idea to run the same OS on the desktop.