Compared with the Series 5, my personal opinion is, 'The Revo sucks'. The screen is to small, and it's got a keyboard like a ZX80. (Remember them).
Half the useful programs are missing, like Program, Sketch and the Spell Checker. They are available on the net for download, but take up memory on the Revo.
One of my biggest gripes is the lack of the memory card slot. 8mb sounds cool, until you half fill it with programs that come as standard on an 8mb Series 5.
On the plus side, is the Revo's IRDA port. It's accessible via the OPL programming language. (Once you've installed it !) I haven't actually found a useful purpose for this yet, but at least the door is open for programmers.
Watch this space !