Mitch Bowling, Senior Vice President and General Manager of Comcast High-Speed Internet, said. “We’ve made a number of complimentary speed increases over the last few years and we focused this latest increase on upstream speeds so our customers can take even better advantage of the ever-expanding amount of interactive applications the Internet has to offer.”
Unfortunately the fine print for PowerBoost makes it appear less useful than you might think. A FAQ on the company's website says the speed increase will last for "as long as the 10MB of a file download on Comcast's 6Mbps High-Speed Internet service, and as long as 5MB of a file upload." Unless you consider 25MB files to be "large" it doesn't seem like Comcast customers will likely see it as more of a PowerBust.