When I bought this unit three years ago, I was looking for something for the home that could laser print like a champ, scan documents, and make copies. This unit by Brother surpassed my expectations and is going strong since 2008 (it is currently 2011).
It is an absolute workhorse that never fails. The multi-page feeder, the single-page feeder, and the copier glass are all top-notch. Never any artifacts or problems in my photocopies or scans. The one-touch scanning software that Brother provides with this unit, called "Control Center," is absolutely top-notch. You put your document on the glass, open Control Center, and click the button. Bam. The document is scanned to your exact specifications (file format, size, color format, etc.) into the location you specify, by the naming convention you specify. A great freebee that makes life easier. I think Brother really "gets" that; products like these are supposed to make your life easier. This unit certainly does that.
I can't recommend this product enough. If you need laser-quality black-and-white printing and don't need color printing, this is the only way to go.
If I had to quibble, I'd say the construction sometimes feels a bit flimsy. It wouldn't take much pressure to break some of the plastic parts. I probably wouldn't recommend this unit for a busy office (although I have seen it in busy offices, and it seems to do just fine). But for the home and my purposes, it's a champ.