Done a master thesis on it, couple of papers, and now doing a PhD dissertation. That wouldn't be possible without Kile.
the process of installing Kile on windows is very long and hard and nasty( you need KDE and ...) the oppening and compiling a .tex file on windows is slow. i think Texstudio 2.3 has more usefull feauture than Kile.
Best LaTeX Editor ever.
Kile is an excellent LaTeX editor, on the same level as the best commercial ones. I use it to write papers, summaries, exercises and my thesis. Highly recommended.