Benwa writes ...

I have the R2400 and the 7800 Pro. The print speed of a 13x19 is
almost exactly the same between the two.

Who cares? He's asking about the 4800 and it's about twice as fast as
the 7800.

As far as the "PRO" designation, Epson says the 2400 is designed
for the pros. The 1800 is considered the home users version.

No, Epson has a different "Professional Graphics" division ... here's
the link to their products ...
http://www.epson.com/cgi-bin/Store/W...seBVCookie=yes
.... 4800 is on it, the 2400 isn't ...

Here's the link to the 2400 class products, which includes their
consumer-grade inkjets ...
http://www.epson.com/cgi-bin/Store/P...=yes&oid=-8165

As for closer tolerences for the 4800 over the 2400, pure bs.

No, it's well known by Epson users that the Pro models are built better
and to tighter tolerances, with much smaller unit-to-unit variance ...
as one example, here's a quote from their FAQ on the Pro models from
the web site listed above for the Auto Head Alignment feature, which
isn't offered on the cheaper consumer models ...

"How accurate is the Auto Head Alignment and Cleaning Technology used
by the Epson Stylus Pro 4800, 7800, and 9800?

Very. In fact, although you can still perform these maintenance
procedures manually, you will probably never be able to beat the
accuracy of the whitebeam sensor technology inside the printer."

Bill