I have a HP Laserjet P1005 and a Brother HL-2140N (which seems to be equivalent to the HL-2170W sold in the US, minus the Wi-Fi networking).
While I would have really liked the smaller footprint and nicer look of the HP, it now sits basically unused on my shelf. After the update to Snow Leopard 10.6, I couldn't print via my Airport Express station anymore. HP failed to release 10.6-compatible drivers for weeks or months, and when they eventually did, Airport Express had still not been restored for me, even though I tried A LOT and consider me a rather experienced Mac user.
After having been frustrated long enough with HP, I went ahead and grabbed a good deal for the Brother. The machine itself looks a bit square and not as shiny and sexy as the HP, as does brother's web site, compared to HP's. However, everything just works and I couldn't be happier.
Tip: Brother seem to use an optical sensor to determine toner levels on these machines. By simply placing some black tape over the small transparent window you can fool the machine and get some hundreds of pages more out of their cartridges. Haven't yet tried this myself but this tip is all over Amazon.
I have had pretty good experiences with HP's business offerings but I definitely won't be getting (or recommend) another one of their consumer-level models anytime soon.
Also, over the last few years, I deployed half a dozen Samsung b/w lasers at family members and friends. Had one of them myself. Everyone has been very happy with them.