want to try KDE 4.6 from sid on squeeze

["Juan R. de Silva" <juan.r.d.silva@gmail.com>]

I'd like to try to co-install KDE 4.6 from sid to my standard GNOME 
squeeze install.

Hence 2 questions:

1. Is it stable enough now or it's better to go with KDE 4.4 from squeeze 
repo (though to have 4.6 instead is quite tempting)?
 
2. I'd like it to co-exist with my current GNOME installation and get a 
chance to login to either of them as needed. What is the best way to do 
it?