Speed Doubling?

Has anyone actually been seeing the speed upgrade yet? I am on preferred and received an e-mail yesterday saying that my HSI had been upgraded to 50Mbps. However, I'm still only seeing 25Mbps on Speedtest.net. I'm in Kansas and was just curious if anyone was actually seeing the speed increase yet. I'm using a Motorola Surfboard SB6141 that is more than capable of that speed.