No,Sid is not a rocket science kind of stuff

Lenny is though better for Desktop user.
with Sid,I will occassionally have to force some packages(dpkg --force-x options) to install esp overwrites etc.
with Sid,daily updates is around 30 MB these days

,you may have to run cron jobs at Happy hours(2-8AM) for installing these updates,else ur bw limit will exceed
Still,am happy with Sid,I occassionally submit Bug reports,it is feeling good inside the "system"(Debian).
@kalpik:Upstart -I thought u know Ubuntu uses it and may be Debian too will replace sysVinit for upstart.only problem is upstart author wants to incorporae HAL features into upstart,thus by removing HAL out of Gnome system(which obviously Gnome devels will not approve!).
as of now,Upstart hardly uses its benefits due to running in sysvinit compatible.
do support this!
http://brainstorm.ubuntu.com/idea/35/
-advantages of upstart :-
http://upstart.ubuntu.com/