I bought the 55AG about 10 days ago, was not impressed with the firewall, and spent a couple of hours online with Linksys support to see if my firewall problems could be fixed. They could not, so I was going to return it. I just happened to check the Linksys website last nite and saw the new firmware had been posted (1.67). Among other things it includes all of the upgrades from 1.40 (which was never posted on the Linksys website), including an SPI firewall that actually works (i unpacked the router, loaded the new firmware and tested it). Why tech support couldn't tell me about this at the time is a mystery. Now my dilemma is whether to keep the 55AG, or keep the 54GS that I bought a couple of days ago.