Wanted to get one, but heard from a colleague that it's under-powered for its OS, and so rather sluggish. Not helped by the facts that since the last communicator (9300i, which I have):

the OS on the internal (when you fold it open) phone has changed from, S80 to S60, making it less of a "communicator", and introduced a new platform where Nokia hasn't yet hammered out the bugs and optimized thinks;

the cover-phone is now an S60r3 smartphone in its own right, meaning (so I have understood) that the E90 runs two mostly independent instances of [parts of] the OS. To some, this might be good, but to me....I don't see the point: the cover-phone is just to make calls, and all I want is a keypad for numbers, access to the contacts application and perhaps a watch so I can check the time without opening the thing. For sending SMSes and so on, I would open and use the real keyboard.