Mine arrived today. Had trouble getting it through the door to my work room! My daughter and I had to rotate it vertically to get the the relatively small door to the room I use.
I had re-profiled my monitor with my i1display Pro while waiting for it to arrive. Ran Atkinson's test file through it once it was set up (had a bit of a glitch as the network seemed to set the ip address incorrectly and couldn't find it until I entered it manually). I also ran the same file through my Stylus Pro 3880 at the same time, same paper with the appropriate profile for the printer.
Held my breath ... I had just added some new ink carts to the 3880, having run out recently, and was dreading that I might not see any difference.
But: sorry 3880, there was a very obvious difference, I was happy to see. What I saw on the monitor was nicely duplicated on the print for the p5000. The 3880 was very close in some areas, but quite different in others. Seems to me much better differentiation between reds and oranges. Greens much deeper. Reds more realistic; blacks blacker. Even my wife could see the difference, and she had wondered what the heck I was doing bringing this monster into the house. Colours all richer, and better differentiated, but particularly reds, oranges, greens. Skin tones more neutral.
Out of the box, the prints look better than what I've got from the 3880 in the last 6 years. (Just ran a variety of images through to try it out.)
I did have some trouble initially as it seemed to keep wanting to print to roll paper, although I had some smaller sheets in the tray. There seems to be 4 or 5 different areas to specify what paper is in the printer, and one overrides another. Once I got that sorted (being impatient, haven't cracked the manual yet) it just works. Not used to the vacuum: sounds quite different than the 3880.
I think I'm going to have a lot of fun with this!