i recently purchased Cisco Linksys WAG120N, and i can't connect to it wirelessly from Windows 7 laptop. Computers running Windows XP connect without a problem. I found out there is a software issue between Linksys and Windows 7 at communication dhcp flags and nobody feels responsible to fix it.
Linksys firmware is from 2010, contains know and openly reported bugs, eg. with QoS and i guess now there is even no hope for update. I doubt that anybody would like to invest hundreds millions for a such a bad reputation.
I also have Zyxel, Tplink and Dlink router, and i've never had such problems, not to mention they offer tonnes of options what Linksys is missing, eg. i cant set static IPs, no ADSL signal parameters like Snr, no wifi output power etc.