In what way? What's the problem with the Sky supplied routers you're wanting to address?
Very unlikely for anything worth having.
Had some issues with connection speed tailing off to less than 1 mb per second, ISP sky tested the line,confirmed no faults and sent out a new router, same thing happened, BT engineer came round and confirmed excellent signal down the line with no problems for some time, and he also mentioned the bog standard sky router was rubbish, but he's not allowed to test sky hardware.
I figured if I got a half decent aftermarket router it might solve the problem, and improve WiFi range, which admittedly isn't bad, but a router with aerials sticking up out of it makes me feel better