Hmm, a little disappointed in the look-and-feel department...
It installed very quickly - partially due to the ISO image being opened directly from the hard disk, partly due to the machine being a Core i7 laptop, with 4 real and 4 hypethreaded cores.
The old themes for KDE were "ahead" of Windows XP, but the new Oxygen layout looks very dated (circa 1996), especially compared to Windows Vista / 7 or OS X.
Generally, the performance seems fairly good, Gnome is certainly very fast, although logging on to KDE is somewhat slower.
Playing with KDE for a while, it really is very confusing. The Minianwendungen (Widgets?) are very modern and have transparency etc. The window frames etc. for "real" windows on the other hand feel old fashioned.
The striped wallpaper and boot screen also look very dated.
Gnome looks much more modern, if a little behind the times. A shame, KDE has more potential with the desktop widgets, but the window decoration seems to have gone backwards in time, not forward, leaving KDE looking a paradoxical mess.
A bit strange, that Firefox 4 Beta 12 is the default browser... This is supposed to be a stable release, I guess this is partly down to Mozilla delaying the release of Firefox 4, but I'd still rather see Firefox 3.6.15 as the default browser, purely because it is the stable release, with the option of Firefox 4 Beta... It would certainly make me think twice about using it as my primary desktop.
The inclusion of Libre Office is good - it is also better (although still not good) at importing Microsoft Office documents. Typing in LibreOffice Writer feels a bit laggy, but not as bad as OpenOffice running natively on the iMac, although with 8 cores and 2GB RAM set aside, I wouldn't expect to feel any lag.
Ooh, just logged out of Gnome and it didn't offer to save my document, before logging off! Make sure you save your work, before deciding to log off!
Hmm, just double checked and the VM was giving openSUSE 1 core, so I changed the settings, to allow it to access all 8 cores and it is now much slower!

It is taking forever to log on - booting took over 1 minute, logging into KDE has now been going on for around 4 minutes!
On my third re-install now.

It didn't like having access to all 8 cores and hosed the original installation. The next install stuck at 15%. I've now limited it to 4 cores and it loaded ok. But KDE keeps freezing and not letting any keyboard or mouse input (the mouse moves and things light up when I click on them, but the click isn't registered).
Still slow and stuttery, in a way that Ubuntu wasn't on this machine. I much prefer SUSE, but the latest version is a disappointment.

Just compared it to 11.3 running on my iMac under VMWare Fusion, 11.4 does look better, but it still looks stale.
Edit: LXDE doesn't work, the $HOME directory isn't registered.

Edit: And now Gnome has frozen.

After having eagerly awaited this version, it is turning into a real disappointment.