1. Messing, not messaging. I thought messaging too at first glance
2. It's fragile. Search for usb port troubles
3. Many things, icluding the rotating screen need some work from you, sometimes involving the terminal. ON the other hand you can do amazing customizations on this phone
4. Go for it.
5. Beware of the "new" N900's on ebay. Better buy from a regular user who's been taking care of his phone