Got it delivered today. Mic works so far. My first impressions are(whatever I have played with so far):

No WOW factor so far(mainly because I had 5800 for a while before buying this one)

Better Screen resolution and default font size. Able to read clearly without zooming in.

Email hangs up once in a while(both gmail and nokia messaging(hotmail/yahoo). I hardly have 10 mails in inbox. More frustrating one for me is I'm not sure when it would show the inbox folder. I had to go back and forth for it show the inbox folder most of the times)

No Exchange 2003 support yet (I feel 5800 had better email support/options). I can't check my work email and calendar.

No portrait view except for phone mode. It is kind of weird way of getting in to phone mode as well. Not intuitive.

This phone(in the current state) is definitely not for non-tech users.