The only issue I saw is the toner color match on laser models could be a bit better. Still highly recommended for anything except photos.
"Innovating"
I'm surprised people say no driver is required, auto-recognized out of the box etc. In contrast, I agree with the parent post that Brother requires a very non-standard binary installation that will throw various errors on a clean Intel 64 bit Ubuntu 21.04 LTS installation.
I tried this 4 times with 2 printers, 3 times it did not work and 1 time it worked. Never got WiFi to work on a Brother laser, so had to go by USB, which is annoying.
Edit: Still better than my $450 HP duplex business printer, which stands unused due to forced subscriptions and rejected cardridges. So far, the best experiences I had with a Kyocera b/w laser and Lexware b/w laser (the latter in the office, so I did not install it). Brother is okay, but with random driver fiddling required.