Keith, I've read the review, looked at the overview video, and as a relatively unhappy P900 owner, I'm sold.
All of it reflects your usual excellent review skills.
The "good?" news is that my P900 is currently working well (second unit, a refurb). The bad news is the refurb came with a full set of inks and I already had a fair amount of ink. Since I'm not sure I can sell the P900 in good conscience, though it's probably as reliable as any P900, I'm not in a hurry to give away all that ink. When either the ink is gone or if the printer significantly misbehaves, it's history.
I do wonder about your use of Epson ABW for black and white. I have been a happy user of Roy Harrington's QTR RIP for a long time and it makes excellent monochrome prints. In my limited testing, QTR is superior to ABW. I've even, horrors, printed straight untoned black and white with the plain Epson driver and it looks pretty good. I wonder if you could comment on this.
Thanks again for all your superb efforts with the review.