It's pretty cool. I got the 64 bit DVD but I think I'm going back to 32 bit until the rest of the world catches up.
KDevelop 3.9 won't open my project from KDevelop 3.5 so I wanted to just use KDevelop 3.5 until my project is done. But the package for KDevelop 3.5 is 32 bit. I can install it but it is useless to me. I think I have to go back to 32 bit OS. (Will a .tgz package for Slack 12.2 work on 32-bit Slackware 13? I don't know.)
The new KDE is extremely flashy if you're into that sort of thing.
I mostly wanted new Slackware for the new X server so I can play doom3 again. I don't really care about 64 bits, I don't think I do enough bleeding edge stuff to notice. I just want compatability.