I've got a brother 5140, and if I had to do it over again, I wouldn't.
It's noisy, despite a regimented cleaning schedule. The toner light comes on at odd times and will remain lit for long periods of time, and then go off again as silently as it came (and no, it's *not* low on toner).
I could write a long rant, because I've slowly come to hate the thing, but basically, it's really really loud, it prints images that can only be described as crappy (they're actually worse than crappy - I didn't know it was possible in this day and age to print images so poorly), and the tech support is worthless. I spent two weeks trying to find out why my toner light was on (after 500 pages of light coverage), to be told that my toner was low (I'm now at 2500 pages, still printing strong w/no indication of low toner). But the loud thing just drives me nuts - the whole thing squeaks like you wouldn't believe. Sometimes the recommended cleaning works, and it's silent for a whole 10 pages or so, but most of the time, it's just noisy.
And did I mention that the images are CRAP? I wasn't expecting much (as far as image quality), but I got even less than that...
On the other hand, it prints fast and has crystal clear text.
But I wouldn't touch it if I had to do it over...