"... I'm also quite interested in those who DON'T use Ubuntu and what their thoughts are on why they don't use it ..."

Using Ubuntu 8.04 64AMD desktop, downgraded from 10.x. User since Ubuntu 4.x.

I use the 8.04 install because a) got breach using default apache (maybe my fault/maybe not) b) because the changes in the sound system to http://en.wikipedia.org/wiki/PulseAudio means audio trouble big time. As the distro has progressed I now get c) dependencies. Why do I need to install whole slabs of applications I don't want need, then get updates for apps I never use or want?

    "... When first adopted by the distributions, 
    PulseAudio developer Lennart Poettering described 
    it as "the software that currently breaks your  
    audio".[6] Poettering later claimed that "Ubuntu 
    didn't exactly do a stellar job. They didn't do their 
    homework" in adopting PulseAudio[7] for Ubuntu "Hardy 
    Heron" (8.04), a problem which was then improved with  
    subsequent Ubuntu releases.[8] However, on October 
    2009, Poettering reported that he was still not happy  
    with Ubuntu's integration of PulseAudio.[9] ..."
    http://en.wikipedia.org/wiki/PulseAudio#Adoption

I shouldn't have these problems (sans maybe (a)). Have used linux since '96 I'd say I've got less stability in the late 9/10 releases at sub-system level. Especially sound. When I get worse results than when I configured Ubuntu 4 or Slackware or RedHat or OpenSuse or Mandriva I ask why am I using this distro? (yes I've used/installed them all and some)

Moving to obsd. The 6m dev cycle is a pain but it's got gnome, is safe, secure & free of cruft of useless apps. I'll miss apt-get :(