Hello,
I just bought a 655 last night in the hopes that my ping woes would go away. I had a Linksys 54g before; it worked, and when I'd go to speedtest.net, I get the download and upload speed I should, but my ping is high (140ish). When I removed the Linksys, It'd be 90(ish).
So I chalked it up to the Linksys, went out and dropped a hundred bucks on the 655, and it does the same thing.
I've tried everything I did with the Linksys. I tried turning off the firewall, opening up ports, giving preference to Steam.
I've got Road Runner 15 down / 2 up, and I live in Tampa and use the Tampa based server on speedtest. Actually, it doesn't matter what server I use, the ping sucks.
When I remove the 655 and plug directly into my modem, everything is fine.