Despite costing more than traditional inkjet printers, I find that build quality is not that great (cheap creaking plastic, scanner bed occasionally detatching from its hinge).
Another issue I have with it is that ink level reporting is inaccurate; indeed, the manual itself recommends to visually inspect the tanks, which are semi-transparent and can be observed without opening the printer. However, I found that it's impossible to do that because dried ink covering the inner surface of the tank makes it impossible to distinguish the actual ink level line. Because of that, I have to remember to look inside the tanks to check if a refill is needed from time to time.
That said, ink lasts ages and refilling is cheap compared to cartridges, so overall I'm happier with it than with any other traditional inkjet printer.
If you don't need color printing, laser is the way.
The printer itself is quite well-built, never clogged even if I don't use it for weeks. (I do cover it with a table cloth if not in use, though)
In short, I'm quite satisfied and will definitely recommend Brother printers to others.