I would take issue with that. The basic concept is nice (swiping to get to the task switcher is intuitive), but the current implementation is too limiting. I often find it to be less productive than using Maemo 5, and the lack of 'proper' homescreens is a fail IMO. Having alternate states for applications when minimised is not an adequate replacement for homescreen widgets.

I think many N900 owners (especially those that enjoy customising their homescreens using Queen Beecon etc) will be underwhelmed by Swipe UI once the novelty has worn off.