I bought this printer after carefully looking at reviews for similar laser printers. For a network ready printer with a print speed of over 20 pages per minute and with an auto duplexer, there was nothing else that came close in the price range.
Installation of the printer was very simple. Unlike other reviewers, I had no problem setting it up on the network. In fact it was as simple as connecting the network cable to my router and installing the driver software on my laptop. The software proceeded to find the printer, and a few minutes later I was printing fine. I have added the printer on two Windows 7 laptops and a Windows XP PC, and all are able to print over the network with no problems. There are also Linux and Mac drivers on the Brother website, although I have not tried these. Just to be very clear, this printer only supports wired networks as it does not have built in wifi. However you could, for instance, connect it to a powerline network using the appropriate powerline product.
As others have noted, the printer is fairly noisy when printing, although not particularly louder than other laser printers I have used, and certainly not something that I find to be a problem. When printing, the printer uses up to around 500W of power, but after a few minutes it goes to sleep. In sleep mode, it uses less than 1W of power (0.6W according to my power meter) and is completely silent. As soon as someone prints over the network, it automatically wakes up from sleep mode and begins printing.
The "starter" toner cartridge that the printer is supplied with has enough toner for 700 sheets according to the manual (I can't verify this as mine hasn't run out yet). There are two replacement cartridges available - TN 2210 has enough toner for 1,200 sheets and TN 2220 has enough for 2,600 sheets. The latter high yield cartridge is available online for around £50, so cartridges are not the cheapest of any laser printer, but also far from the most expensive. There is a separate drum which apparently has to be changed after around 12,000 pages and costs about £60 online. As with nearly all printers, it is not supplied with a cable, so you will need to buy either a USB or LAN cable, depending on how you intend to use it.
Finally, it's worth noting that at the time of writing there is a free three year warranty promotion on Brother's website, which is valid until the end of March 2012. It is worth checking the latest promotions on the Brother website to see what promotions are available and to obtain the promotion code you will need when registering the product.
All in all, I am very happy with this printer, which was a bargain for the price.