I've got the WRTG54 wirless router (forerunner to the one you're considering). I've had it for a few years now, running on ntl. Moved last month and got ADSL, so added the matching Linksys ethernet ADSL2 modem.
The box was simple to set up...although like most routers no security is enabled out of the box, so you'll want to switch that on pretty quickly after installing!
Worked perfectly well, never a problem with connection (and I used to live in a really old house with solid wattle and daub walls that removed all mobile signals!) and I could still use it in the garden.
The modem is good, but there's a little documented 'problem' with the modem and router as a combination. Easily overcome if you do a bit of googling and like the router - works perfectly.
No hesitation in recommending Linksys routers to you.
EDIT: It's a couple of quid cheaper at Amazon and free delivery too
http://www.amazon.co.uk/exec/obidos/...246322-3270810