There's not much negative that I can say at this point. I purchased this printer due to the specifications I found attractive: Large Print/Scan/Fax (11x17), Wireless, automatic Duplex Printing. I have not tested the faxing, as I rarely use it. But it looks like the software allows you to fax from your computer quite easily -- e.g., print to a virtual "fax printer".
Setup was quite easy, and was done in about 15 to 20 minutes without any problem. That included unpacking, powering the printer, installing the ink, self-test, and setting up the wireless. Once that was done I downloaded the latest drivers from the Brother website (there is a drivers disk included, but may as well make sure you're getting the latest; the web address is in the quick setup manual). After that, everything worked as expected.
I was able to scan to a USB device, which allowed me to save as PDF or TIFF. I then specified "Scan to File" and it scanned wirelessly to my computer as a JPG. If you really want to know all the modes and formats, you can go to the Brother website and download the instruction manual for the printer.
Duplex printing worked great. I printed two ~60-page documents in duplex mode and when it was done it was ready to hole-punch and put into a folder. No paper jams. So much easier than trying to do that manually!
To be sure, this is a hefty printer and you should consider where you'll put it. As for speed, this may not be the fastest printer on the block, but for the casual printer'er I'm fine with a slower output. I usually set the print quality to "Best" and let it do its thing.
I'll update this review if there is anything significant to report.
-- CHRIS