Paper handling is the 2nd question. I've found the P800 pretty robust. I've used the top loader pretty much for everything until just recently when it began requesting that I use the front "art paper" (17 X 22 fine art matte paper) loader (when using QuadtoneRIP). There are some minor alignment possibilities in running a piece of paper through twice, but not of great significance. Works fine so far.
By contrast I've seen some negatives on the P400 for paper handling. Not a whole lot of info on either the P400 or P600 printers btw, so I hope that's not telling me something (i.e. no one's using these). I think Jon Cone's suggested they were about to run a workshop using the P400's so maybe that will provide a decent "lab".Any information here would be helpful. Thanks!