Just thought I'd share some of my experiences with the new KDE SC 4.6. I'm traditionally a Gnome user and more recently have been playing with Unity. I really like it but it is so unstable that I can't deal with it yet. When you have a Core i7 you should be able to watch a simple video clip while moving some Windows around without massive stuttering. I figured I'd give KDE a go since there has been a lot of talk about how much better it has gotten.
The last time I used it was 4.3 or 4.4. It is much smoother now and seems very stable. I generally like the Gnome style apps more with a more streamlined, some would say simple, interface. Everything is very fluid and the talk about the improvements to KWin seem to be well founded.
Also, Kpackagekit has gotten worlds better. It may not quite be as good as Synaptic but it can do most of the same things and not cause problems.
I'm still exploring and finding new things that they have fixed or introduced. I would recommend anyone having Unity troubles give it a go, even if you just install it alongside Unity.
Stay Classy
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