Here are the diagnostic files for both cases, EXA and XAA on OpenSUSE 11.0, 
using XX.Org X Server 1.5.2, libdrm 2.4.1 and the latest Mesa 7.2 patches. 
Regardless of what these files say,
- the overall performance using EXA is still horribly slow on my 865G compared 
to XAA
- starting X server and switching to KDE after logon flickers in EXA mode and 
shows for about half a second (plus minus) an uninitialized video buffer)
- switching on KDE Desktop Effects (Composite) crashes the X server with a 
backtrace leading to libdrm (happens already for some months even in libdrm 
2.3, for both XAA and EXE acceleration).
Not really useful at the moment.

On the other hand, what people recommended in this thread, and ignoring
the recommendations of Intel developers, using MigrationHeuristic
"greedy" leads to a broken systray, where are no icons visible, but only
some kind of "colored trash".

** Attachment added: "Diagnostic files for EXA and XAA"
   http://launchpadlibrarian.net/19118119/Xorg_intel_diagnostics.tar.gz

-- 
EXA is balls-achingly slow
https://bugs.launchpad.net/bugs/177492
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