I use a an MFC 7340. Used Brother's proprietary drivers and found both the drivers and the install notes to be very concise, with one exception:
You need the cups-bsd package if you want lpr/lpd service from the printer.
Also sometimes a full-upgrade mashes the udev tweaks and you need to fix it manually.
On the whole, I kind of like Brother's level of support. I would buy another Brother product, I think.
for as long as the world remains. for as long as time remains. so, too, will I remain. To serve. To help. And to make my contribution. Also please visit old friends at forums.debian.net