I'm using an Express with Comcast. I have basic cable service and, depending on the test site that I use, I'm getting as high as 24Mbps! I started out with the Express set to factory default. Then, I plugged it into AC power and connected the Comcast modem. I fired up Airport Utility and accepted every default selection that the Express presented to me. The only thing that I did manually was set the passwords (WiFi and administrative).