"Personally, I was snared at the 4.0 release. It seemed to
include the most interesting innovations on the GNU/Linux desktop
(and still does). But the 4.0 release was not ready for everyday
use, and I waited over a year for KDE 4.2 before switching to KDE
for my main desktop.
"Inevitably, that switch brought a degree of disillusionment.
After all, following innovations is very different from using a
piece of software every day. You need daily use over several months
to appreciate a feature fully, or to become thoroughly irritated by
it. I eventually found that I had growing lists of both pros and
cons -- some minor, and some major, but all of which affected my
reaction to the KDE 4 series."