It's a bit soon to tell yet, Dave. I only started to get it all set up this morning. Had to start out with a hard wired ethernet connection because Internet explorer wouldn't connect to the control setup in the box. I didn't find out where on the installation CD they had put the extra "do it manually and know it's been done right" instructions until I was wired in.
I later unplugged the ethernet and got the wireless bit sorted, but I've only just got the third (oldest) computer configured for the new wireless connection.
In a few days the Voice-over-internet bit of the magic box should get activated and we should be getting a spare phone number. If I read their website correctly I think it gives us FREE outgoing calls to UK land lines and also within unspecified "fair usage" to a stack of other countries. We will see what transpires.
Quack!
Geoff.