So what are the advantages/disadvantages between the 2? What attracts me is the ability to use rolls in both and the vacuum feed in the 5000. I appreciate that the 5000 is significantly larger than both the 3880 and the P800 but I do have space - subject to one caveat. I load both A3+ and A2 paper in the 3880 through the rear slot. Neither the 800 or 5000, from what I can tell have a rear slot, instead require front loading. From what I can tell (from a few videos on YouTube) on the 800 at least you feed from the front but then the sheet is taken upwards by a rear paper guide (in distinction to front feeding on the 3880 where the paper protrudes from the rear significantly). So how much rear space does one need with both printers to front load A2 paper? I can probably accommodate whatever is needed but ideally would be restricted to about 24 inches rear clearance
We have both the P800 and the P5000 as well as other epson printers. The P800 is capable of fine colour print quality. But, we use it primarily as an office printer. It is used by many former users of the 3880 and many semi-pro photographers. But, the P5000 is a true professional production machine.
For my money the addition of the orange and green inks alone make it worth the additional cost. You will find those who believe these two inks are only used for prepress proofing and Pantone matching. But, while it is true that these two inks do facilitate that need, they also do much more. The orange and green inks expand the achievable colour gamuts and are used for particularly strong saturated colour which would not be achievable without the participation of these inks. We have done many tests that prove this beyond doubt.
The roll attachment on the P800 is flimsy. The screw attachments often break off. It is a cheap add-on. The 5000 is designed for rolls and sheets alike. Rolls self load whereas they can be tough to load on the P800.
The P5000 has 1 front loading access, 1 top loading access and one paper drawer for sheets. The auto-load feature assists loading.
The vacuum is a very valuable feature which is not available for the P800. It holds paper flat to the patten whereas curled paper can be trouble in a p800 and quality is diminished.
The P5000, like its SP4900 predecessor, is a fabulous machine. In fact, it is the same machine with new software and HDX inks. Sure, like all Epson printers, some of these printers are more trouble than others. All of our printers have been excellent machines. But, we use them regularly and keep them clean.
In short, the P800 is a good machine for the semi-pro who prints once in awhile. But, the P5000 is a far superior machine.
I hope this helps,
Mick