I use an iPAQ H4700 and my N800.

Sorry, my experience is that to the user the Windows Mobile interface is superior, and that availability of quality complete applications (not alphas and betas) is superior for Windows Mobile.

Under the pretty surface, though, Windows is junk and it is clear that in terms of system stability, the the N800 is superior.

Further, all connectivity related issues seem easier on the N800.

The lack of a PIM, and the poor CPU performance that severely limits video functionality are showstoppers for the N800, which is too bad. NOTHING makes for a better out of the box experience than putting your favourite TV show on an SD card and just playing it on your handheld. With my iPaq, that's usually possible. With the N800.... fugetaboudit.