In my hands it was uninstallable. With an md5sum-checked CD of this:
Debian GNU/Linux 6.0.0 "Squeeze" - Official i386 NETINST Binary-1 \
20110205-14:34
it booted, got about halfway through the install, and then started giving CD
errors. I tried a second checked CD as well, and trying to install from a
flash drive also gave CD errors. I filed bug report #613835.
I was able to install testing (Wheezy) from a CD and have given up on Squeeze.