The N900 keyboard really is nice (see my full article), but it is quite different typing on an iPhone and typing on an N900. If you've been typing on an iPhone for a year or more, then it is going to be difficult to switch to the N900, because your fingers and brain have adapted to the limitations and idiosyncrasies of the iPhone's suggestions and typing pace. But, for me, having typed on neither a Nokia keyboard nor an iPhone virtual keyboard, it seemed very nice indeed.