This test was performed in the Best and Normal modes. Here are the scans:
The effective resolution doesn’t differ. The main problem with both the scans is the fuzzy margins (this is more conspicuous on the sides rather than on the top and bottom). There is a negligible difference between the modes. Let’s see if it shows up more on a halftone image.
The main drawback is obvious – the toner fill density is excessive. The darkest tones merge into a single color in the right part of the gray-scale. You can discern small details in the picture, but it has some oversaturated areas, too.
A funny thing, the Draft mode produces a better-quality print than the Normal mode. You can see each and every color plate here, only the lightest plates are not printed out. One more flaw is that the borders between the plates of the Gamma 1.0 gray-scale are barely visible and are not discernable at all in the middle of the scale. So, the photograph looks overall better, but some detail is lost in the lightest areas.
It’s like in the first case with the same excessive toner fill density and over-saturation among the darkest tones. So the results of my tests suggest that it is going to take some serious tweaking of the manual quality settings to print black-and-white images with an acceptable quality on this printer.