Yeah I got a free one too. I also had the netgear.
I just complained about poor WiFi signal since my neighbours had set up wireless networks and mentioned the extended range N can offer.
I've since upgraded to fibre and was sent another new router (the same hardware but with the fibre firmware)
I find the 2504N to have better overall WiFi performance, however the web interface is annoyingly slow to navigate.
Sky Fibre Unlimited
Ashington (Northumberland) Exchange