Brother rates the DCP-9055CDN at a very healthy 24ppm in both black and colour print. Under test, we didn't quite see this speed, but our five-page text print did give 15ppm and the 20-page document, raised this to 18.2ppm, so three quarters of the rating. There's no draft mode on this machine, so all print comes through at the same quality.
Duplex is standard and printing the 20-page document as a 20-side, 10-page test gave 12.3 sides per minute, a very respectable result. Our single-sided, five-page text and colour graphics document returned only 11.5ppm, though, which is disappointing when colour has the same speed spec as mono print.
A single page colour copy from the flatbed took 14s and a five-page mono one from the ADF completed in 25s, both very reasonable speeds. Finally, a 15 x 10cm photo on an A4 sheet and at best quality, also came through in 25s.
Print quality is more than good enough for even an exacting office, with clean, black text from the 600dpi engine. Colours are intense and show no signs of banding, though shades of blue and green are on the dark side. This also shows in the photo print, where detail is lost through colours tending to black, though again there are good levels of detail. A colour copy does better than some we've seen from similarly priced printers.
There are two different capacities of toner cartridge available for this machine, with the higher yield consumables offering 4,000 pages of black and 3,500 pages of colour, each. Although there are also drum, transfer belt and waste toner bottles to replenish, these have high yield figures of 25,000 and 50,000 pages each.
The overall page costs come out at 2.8p for ISO black and 11.8p for ISO colour, neither of which is particularly high for this class of machine. Indeed, the black cost is competitive with much more expensive colour lasers.
If you have a lot of mixed black text and colour business graphics documents to print, and need speed and sound print quality, combined with reasonable running costs, the Brother DCP-9055CDN fits the bill well. Although it might be nice to have a duplex scanner and a front panel USB port, these are available in other models in the same range, if they're essential.