When compiz, or metacity don't launch, you have no window decorations, you can't change context, and you can't move between desktops (obviously). I just added compiz manually back via the gnome-session-manager. Aside from that weird quirk, Jaunty is great. Network-manager sucks with the Broadcomm 802.11g card a whole lot less, instead of about five minutes of hit-or-miss WPA2 authentication, it now logs on first try.
