How "stable" is "testing"?

[Neal Lippman <nl@lippman.org>]

I am wondering how stable people are finding testing for use on their
workstations. I am running woody, and very happy with it. However, I
would like to be a bit more up to date with some of my software - for
instance, I'd like to be using KDE 3 instead of 2.2, and the newest
evolution, so I was thinking about doing a dist-upgrade to sarge. I
don't, however, look forward to severe breakage now that I finally have
my system configured and working.

Any advice appreciated.

Thanks.

nl