I'm pretty pleased overall. I do have some spots on my LCD so I'm gonna have to swap the device, not a big deal.

Software-wise, the media player is definitely on the funky side. Definitely usable, but funky performance sometimes with skipping/stuttering being the worst offender. You also can't search in album view which is ******ed. The type to filter search works great in song view (and artist view I think). Today I started watching a movie, then left the media player for a moment. When I went back to resume the movie it said format not supported (tried it again just now and after about 5 seconds of the knight rider-ish lights the movie resumed, I have restarted the device and refreshed the media library since the last time I tried to play it).

The email app (at least for me, using an IMAP server) is pretty terrible, but usable. It's slow, especially loading images in HTML messages. This also worsens the performance of other underperforming apps (ie. the media player). The other thing which is super annoying is that it doesn't put sent messages or drafts on the server. To be fixed in Harmattan :-/

I'm sure apps will get streamlined and work better as time goes on (or people will make/port better ones). I love the device and the platform, but I really don't want to be hyping up the Maemo 6 device next year because of how it fixes all the problems from the N900/Maemo 5.

EDIT: The reason for this post being primarily negative is to counteract all the people saying it's "perfect" or has no problems. It's definitely a bit rough and people should be aware of what they're getting into. Everyone already knows all the awesome things the N900 is capable of (or is claimed to be capable of).