I've had an sc-p600 here for a few weeks and have written up a longish review.
Printer review - Epson SureColor P600 A3+
It includes quite a lot of specific B&W print related info, and all my profiles/curves/measurements are available if anyone wants them (for non commercial use).
It has to go back tomorrow :-( but if anyone has any specific questions that I might not have addressed in the review, please let me know?
Hope it's of some interest?