Summary: I purchased the Zyxel NBG4615 router. I can assure this has not been my first router generally, but it is definitely the last router from Zyxel, and here is why: First, I installed the latest firmware, as recommended by the manufacturer. This router cannot even hold the time settings, after switching it off and on, it is like a time machine, it is back in 1970. Maybe this is meant to indicate the year of its quality standard.
Summary: DO NOT BUY ONE OF THESE. I received mine and had no end of trouble setting it up. Repeated calls to technical support did not resolve the issues and in fact on being told that tech support would call me back same day, 2 days later I had to call them. Rubbish product, rubbish support. I've returned mine. Don't touch it with a bargepole.
Summary: I bought this router, having spent much time searching on the internet for a router which would send wireless through a couple of walls. According to the spec, this looked the business, so I took the chance. What a waste of time - the bottom line is that having spent literally 3 hours trying, I couldn't get wireless to work (it only worked if I ran a cable between my laptop and the router).