How stable is KDE 4.2 in unstable ?

[linuxguy123 at gmail.com (Linuxguy123)]

I'm chomping at the bit to start using KDE 4.3.  

How stable is 4.2.9x in /unstable ?  How would I install it without
enabling /unstable for everything ?

When do we expect KDE 4.3 to be pushed into /stable ?

Thanks !