Is right! there is nothing like an N900!

in a very few words you are going to miss:
hardware
the fm transmitter, IR, the keyboard,
OS
the multiple desktop with all the infinite widgets, shorcuts etc..

see in a good way you are getting;
hardware
this shiny beautiful fancy looking phone! with multitouch and NFC!

OS
the best swipe method! left, right, up, down, double tap, so smooth and fully customize!!
Better market store apps, games etc..
and it steel runs MAEMO!