'No real advantages over the Visor Deluxe for the average user.'
'the Pro doesn't come with standard wired or wireless communications connectivity (other than infrared), nor is it good as an entertainment device with its monochrome display'
'The Digital Media System 815 includes an integrated sensor pod, presentation pen, and annotation software to turn almost any surface into a digital whiteboard or large interactive computer display.'
'The Zire 31 also replaces the two-way navigation buttons used on the Zire 21 with a much more useful five-direction pad.'
'some very nice improvements over the prior Zire models'
'The color display is a passive-matrix LCD with 160-by-160-pixel resolution; it washes out in bright sunshine, and in general is noticeably inferior in quality'