Well this WAP was purchased to try and fix what I thought were "wireless" issues in my house, and the coverage of this one is streets ahead of what I had before, and even the prior one didn't work well.
Worse I have a White s3 which belongs to my colleague and that isn't as bad with wireless.
Mine is no problem with Wifi :)
I have Linksys WAG320N - dual band and I must tell you that you'll need to set the setting right. Otherwise you'll end up with lower signal strength.
Broadcasting to: B/G/N Mixed
Range Channel to: 9->11
Frequency: 20Hz Standard
And everything else Auto.
Wide 40Hz resulting in shorter distance broadcasting and slower transfer rate (Mine anyway).
Set the Wireless N to 2.4GHz bandwidth. Set to 5GHz helped a little but will result more compatibility issues with the rest of your equipments.
Best piece of advise, change ROM or reflash it to fix Wifi kernel on your phone. :)