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This is the newer version of the MFC-8860 from Brother, and is a step up from the MFC-8480 as the 8890 provides full duplexing on scanning, copying, and faxing. The MFC-8480 only provides duplex on printing.
I have Macs--several of them--so I've been looking around for a while for a multi-function laser machine I could use for printing, scanning, copying, and the occasional fax. I'm thoroughly impressed with this machine so far, and following the install from CD, everything just plain worked. The printer driver was installed, it included a fax option right in the driver itself (on one of the print option tabs), and so was the TWAIN driver for scanning, and so was their ControlCenter software, which provides access to all the settings for the printer, documentation, and a bunch of customizable presets for the different functions of the printer (most useful for scanning different kinds of documents to different apps on the Mac, including an OCR capability).
The duplex is great--the auto-document feeder reads both sides of documents for copying, scanning, and even faxing. Most less expensive models (like the 8480 and a Canon MF4370 I recently tested) will only duplex on printing, but the 8890 will both read and produce 2-sided docs for any function.
Network capabilities for Macs is also top-notch, with both wired and wireless network capabilities, you can use every function of the machine over the network, with seemingly quick transfer rates, even high-res color scanning. By the way, my previous favorite printer vendor, Canon, does not support network scanning to Macs on ANY of their multi-function printers, but this is not apparent until you buy one and try to do it--their support has since told me this is true.