Problems found (more like small nuisances now):
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- if you set the time back to something in the past, the clock service
  crashes and you need to restart qtextended if you want to use the
  clock again
- bluetooth is not working totally ok, only after initial boot it
  works, not after suspend/resume. Seems to be kernel/bluez3 version
  combo issue ... After suspend/resume bluetooth seems to work, but
  receiving files for sure don't.
- if you try to delete the "Wireless Lan", the system crashes ... cool
  huh, a crashed phone? So for now: don't do it :-)
- I had a problem with the battery service crashing on me; all of the
  suddenly (after many suspend/resumes) the device gave me a warning
  that the battery was critical low, but after another suspend/resume 
  cycle, the icon showed a full battery (even though the battery was at
  60% or so)
- for me changing individual callforwarding settings don't work (seems to be a provider thing)
- call waiting (second call) doesn't work as well (again a provider thing it seems)
- slow building up of the Contacts, because of all the sql queries for a*, b*, c*, ...