Mike,
for the moment my experience with the 4900 has been great. Setup was straightforward and quick, the printer is pretty speedy and very quiet, with hardly any noise when idle. The printer is interfaced to my Mac via ethernet, and the network setup was also very straightforward.
Nozzle check after ink loading came up perfect, and I did a print head alignment (based on suggestions from Jeff Schewe gleaned from this forum) which completed successfully in a few minutes.
Tonight I will be loading my first roll paper through it and will be doing some profiling, and I expect to have a few prints through it over the weekend. This is my first Epson pro printer, and I suspect I will have to spend some time figuring out the right settings for my Breathing Color papers and canvas, but I am overall very pleased with my first impressions of this machine.
More to come,
Stefano