I've tested about a dozen and a half different papers in three P800s over the past several months and have not seen any pizza wheel marks; I did look for them, but didn't find.
The Front Fine Art feed can be a bit finicky. I pointed out a way to resolve this in my recent review of Eight Papers on this website, toward the end. Essentially, you open the FFA tray, then feed the paper in through the back support (where the roll paper would go) rather than the front and make sure it is correctly aligned. This is very easy, smooth and works every time. I also mentioned in that article some risk of smearing at the corners loading curly paper. I fault the paper rather then the printer for this, but something to be aware of. It will not affect papers with a *very slight* bow or arc, which I distinguish from "curl", where edges and corners really stick up at a very different level from the rest of the sheet.
I also regret that Epson has made it impossible to measure ink usage per print. This is a feature that Canon offers, in great detail, on the Pro-1000.
Other than that, no issues that I have experienced. The printer makes excellent prints and usage is pretty straightforward as long as you know how to manage settings in the driver and the printing application.