TDE is not really for the nostalgic of KDE3, but made for those who want a light desktop, and nevertheless, with many rich options.
I succeeded to keep KDE3 a long time, after, TDE was for me an excellent news.
KDE (after v.3) is heavy and has not so many options. TDE is much better ! and much better than these desktop : GNOME3 Unity (GNOME3, défaut Ubuntu) Cinnamon (GNOME3, défaut Linux Mint) Mate (GNOME) LXDE Xfce Enlightenment Environnement Qt ...
Best regards,
André