As a functional wireless router this is actually pretty good considering the sub-£15 price point. It supports a decent array of LAN, WAN and firewall options, is fairly simple to set up and seems to hang on to the phone line well. In the few weeks I've owned the device it hasn't crashed or required a reboot. If you give it adequate ventilation it doesn't get very hot either.
However, it does have some issues. The most significant to me is that the wireless will not turn off. There is a setting to turn it off, but it soon comes back on again. Not a problem to those wanting to use it with wireless enabled, but for someone who doesn't (say you want to use modem bridge mode, or want to disable it for security, or worse: thought is was disabled so didn't apply security) it is annoying. Another issue is that it seems if you select a strong password for the config pages it does not let you back in! Some of the DSL line stats are just random numbers (although the sync rate appears correct), and it has a worrying habit of openly stating passwords and wireless pass-keys on the config pages.
I contacted Belkin about some of these issues. To give them credit they responded quickly, but limited to the usual script followed by an offer to replace the device (which went nowhere) - their tech support doesn't seem to be very technical.
For what I wanted these issues limit this product's usefulness. For someone looking for a cheap ADSL2 wireless router and knows what they're doing, it really isn't too bad.