It is a pretty heavy duty environment, much closer to Windows or the MacOS than any of the other window managers I have tried, if that is important to you. It comes with a bunch of utilites, as well. Pretty cool.
•••••

CON:
If you want a window manager and some tools to make X feel somewhat reminiscent of the Finder, it's something to be enthusiastic about.
Otoh, if you like a simple and imho somewhat cleaner X environment, you probably won't care for it. I like MacOS well enough as an integrated system, but I don't especially want a detached pseudo-Finder interface in linux, any more than I want a detached Win95 desktop in linux (ie fvwm95). I ran kde for a day, and was happy to switch back to the latest release of vanilla fvwm.
Nice to have the choices though.
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Where:
By the way, you can also get the RPMS for both QT and KDE at:

ftp://ftp.linuxppc.org

 I have located both the we page for QT
 Troll Tech

 http://www.troll.no/

and "K" Desktop Enviroment The K Desktop Environment
http://www.kde.org/
and obtained the Red Hat versions of the files needed, (kom-0.3.10.tar.gz too),
••••••

Question: How do I run KDE?
I have KDE package installed but cannot find a script to launch it. Then, in /opt/kde/bin, I tried to type kmw. It says cannot connect to X server. Typed kdm, I got a login screen and i was locked out. command-option-power key cannot kill it.

Answer:
Add this to the end of your .xinitrc file:

 kdestart