Daily user here.

My only real disappointment with this device has been the unability to sync my Evolution calendar/tasks/contacts directly with my N900, without having to rely on a third-party solution like Funambol.

But it's not a trivial task since Nokia managed to screw up syncevolution, somehow, somewhere...

I guess the only thing I do miss that might be realistic to achieve is a better MPD solution for the N900, rather than the buggy and ugly client we have now (CuteMPD).