At least, not in the markets where linux is competing against it. It's ease of use, and the "it-just-works" factor. This was my experience trying out the live cd of Kbuntu 8.04. Everything worked. Audio, wireless, etc. The KDE 4 UI definately has the wow factor going on, at least for me. I am not an everyday user of Linux, but one of my test boxes has PCLinuxOS installed. I chose it because it worked pretty much out of the box and had a nice UI. Kbuntu 8.04 blows it away. I don't go for the eye candy as I didn't upgrade to XP until I couldn't run IE7 and upgraded from 2000, but I am rather infatuated with the KDE 4 look.