Much less expensive than the $70 OEM Brother DR420. Only issue I've seen so far is a small, faint, 1/4" long line that repeats 3 times on each page (near top, middle, and near bottom). Tried cleaning corona wire a few times, but no difference. Must be an imperfection or defect on the drum itself. Otherwise, printing has been just fine.
I decided to take a chance on this drum since it is so much cheaper than the official Brother brand one. I'm a few hundred pages into it and so far it has worked great. Just as good as the original one.
PROS: Inexpensive, worked without any problems at all.