Hi
I've had a 4880 on loan from Epson UK for a while and have just posted a review of my experiences using it...
4880 reviewAlthough I've kept this piece to covering just the printer and some standard Epson papers, I've actually been looking at quite a few papers with it (more things to write up over the next couple of weeks :-) )
After building some profiles for a friend's 2400 as well as the 4880, with one of these papers, the difference in gamut was visible, although it hardly jumped out at you.
Whilst I've read of the differences, it's only when I've produced two profiles for the printers, using identical targets, measuring hardware and software, that I feel comfortable in looking at part of a test print and going 'Yes, I -can- see a difference' ;-)
If anyone has any comments, or additional observations, then please do let me know, since whilst I've used it quite a lot, many of you may have considerably more 'real world use' experience.