I've got a handful of A3+ test prints using Matte Black ink on EAM to compare - using canned profiles where applicable on the 4800. I've ranked them, favorite down.

1. B&W image using Matte Black/Color 4800
2. B&W image using Matte Black/B&W Advanced 4800
3. B&W image using Matte Black and custom profile on 2100
4. B&W image using Photo Black/Color 4800

1/2. 4800 prints using Matte Black
The two 4800 prints on EAM using Matte black both look very good, very saleable. Much like my earlier test on Gloss and Semigloss, I prefer the look of the B&W created using Color Mode, but not by much. Creamier! If I were printing with B&W Advanced mode day to day I'd probably try and 'turn it down' something similar.

There doesn't appear to be a penalty regarding color shift with the Color mode B&W print vs the Advanced B&W mode print - but I need to check this further as it is known that B&W Advanced Mode uses only the three blacks, light cyan and light magenta, but I would assume that Color Mode uses whatever it needs too, I'll keep an eye on ink usage to work out what it's using.

I'm thinking that I will be printing B&W via Color mode for now, and getting profiles done accordingly. I like parts of the Advanced B&W mode and can see it being useful for certain applications but I'd rather do those adjustments in Photoshop where you have all the tools you need, and everything is in one place with regards to adjustments to the file (you can save settings in Advanced B&W tho).

3. B&W image using Matte Black and custom profile on 2100
The 2100 print made using a custom profile looks good, metamerism is noticeable compared to the 4800 prints. There doesn't appear to be as much fine detail as in the 4800 prints but not by much. It's not a bad print at all - if it didn't shift so much I'd probably be ok with selling it.

4. B&W image using Photo Black/Color
Blacks look milky in comparison to those using Matte Black, as if a haze is across the image - like it could do with some local contrast enhancement. It wasn't great before (Photoblack on Matte with the 2100), it's not great now - unless you like that look. I wouldn't be happy to sell a print that looks like this.

Having printed Gloss and Semigloss since last Wednesday I am really quite happy to be back in the land of matte! No gloss differential - I love it! I do love the extra punch of the coated papers, but the reflective surfaces bother me. I have a few tests to run through in the next couple of days to compare Gloss and Semigloss prints to the same image on Matte (using the canned profiles, sorry) to get a better sense of what the tradeoffs are, but my gut feeling is I will end up going with a Matte paper for the bulk of my prints.

Today's test prints on Breathing Color's Elegance with Matte Black are very nice, even without a profile. I have a 17m roll of it on hold while I wait for a custom profile for one final evaluation before taking the plunge. I'll probably use that for my new premium and larger prints and use EAM or the equivalent for everything else. But - we'll see!