I decided to give kubuntu 12.10 a try today, and both kde and kubuntu have come a long way. So here's my thoughts on the distro and KDE 4.9
1. Installation
Mostly your standard ubuntu installation experience, but the kubuntu team made a lot of visual customizations to the installer, making it fit in very well with KDE, I actually thought it looked nicer than ubuntu's installer.

2. General impressions
I was greeted with a nice lightdm login screen, with a new QML based theme that made it fit in very well with the rest of the desktop, very simple and clean. It logged in fairly quickly, although a little slower than unity. Once I was logged in I was quite surprised at how peppy the desktop was, KDE has made some huge strides in this area in recent releases, it was significantly smoother than unity on this laptop.

Next I checked out some of the default apps, rekonq as the web browser, dolphin file manager, amarok music player, dragon player video player, and kde-telepathy.
Rekonq was a serviceable browser that integrates very well with the KDE desktop, but I had some performance issues with scrolling on some sites, so I ended up install chrome anyway.
The dolphin file manager is excellent, compared to gnome's nautilus it has more eye candy, more features, and superior performance, that's a win-win if I've ever seen one.
Its been quite a while since I used amarok (I think the last time was amarok 1.4!). I ran into one annoying issue with that, after it scanned my library it popped up a big message saying it couldn't import "duplicate" songs (which were not actually duplicates at all. apparently this is a known bug with amarok 2.x, its duplication detection feature is prone to false positives).
Next I checked out dragon player, when I clicked on a video file kde helpfully searched for and installed the appropriate codec and it seemed to work nicely for local files, very clean interface. Unfortunately it does not seem to have the ability to play files from a remote samba share, which is a dealbreaker for me, so I installed the trusty vlc.
This is the first time I've tried the new KDE-telepathy, the replacement for kopete. I've always disliked kopete, so this was a welcome change. I must say I'm very impressed with this, it actually works far better for me than unity's ubuntu-online-accounts/empathy combo. With empathy I have all kinds of annoying issues, like accounts randomly disconnecting and one particularly annoying issue where windows live will decide it needs to be "reauthorized", and the only way to fix it is re-adding the account in UOA. No such issues with kde-telepathy, all my accounts worked flawlessly, and it has a very nice interface.
Next I checked out the Muon Package manager. Last time I tried this was a much older version of kubuntu, and I remember it being awful and buggy. Not the case now, its very fast, stable, and easy to use. It reminds me of synaptic with a much nicer interface. A much more enjoyable experience than ubunutu's rather clunky software center. I had no issues installing or updating software.

After looking in the system settings, it was refreshing to see how many options there were. I was most impressed with KDE's power settings compared to that of gnome or XFCE. It gives you very fine-grained control over the power management.

GTK apps seemed well integrated out of the box, chrome and the preinstalled gimp looked fairly native.
KDE and Kubuntu have matured greatly since I last tried them, I noticed no major bugs and it was quite stable and fast. I never would have believed KDE could be this fast a year or so ago.
3. Things I didn't like
The way kubuntu has implemented fast user switching is a little wonky. If you select switch user in the KDE menu, it doesn't bring you to lightdm, instead it brings up krunner with another fast user switch option, and if you hit that then it brings you to lightdm as expected. Seemed like a silly way to implement that with a pointless extra click and mouse travel.
The default plasma theme could be a little better, for example by default you can barely even read the text on inactive windows in the task bar, grey text on a grey background. I ended up switching to the new windows 7 superbar-esq "icon-tasks" anyway though.
Amarok and Dragonplayer. Amarok seems a bit buggy, and dragonplayer doesn't have enough features.
Occasional graphical artifacts on the taskbar thumbnail previews (sometimes a little bit will be "left" on the screen when the thumbnail is closed)
KDE's notification area. I find it to be a little clunky, and the notifications sometimes glitchy, this is the one area of KDE that needs the most refinement IMO, but its usable.
Overall I can definitely recommend this distro. In the past I've disliked KDE, and considered kubuntu to be quite buggy, but currently it seems like an excellent KDE desktop implementation.








