Pro : - Lyx is easy to use and stable. - If you write and rewrite on your screen a long text, using LyX is much nicer than vim + LaTeX or Kile where a large part of the screen is used by pointless formatting code.
Con : - One of the set-back of the Wysiwym model in LyX is copy editing. You copy edit the printed draft and when you report the corrections of a mispelled word into LyX it is harder to do because the word position on the line is different on the print and on the screen. - You will hit very quickly the ceiling of LyX and have your documents full of ERT. I remember the first time, I used LyX for my work, I could not find how to suppress pagination on my handout and cursed a lot LyX half an hour before starting my lecture. Then I bought a big fat LaTeX manual and read it and now everything goes smoother. - LaTeX is hard to debug. Error messages are usually quite meaningless. -- http://www.kde-france.org
