said by fishmaster :

That is what the marketing media wants you to believe 'powerboost' is. Yes it gives you a sudden jolt at first. but it is really nothing more than an elaborate 'caching' & 'compression' like scheme where Comcast can actually use less real bandwidth of ones (subscribers) supposed speed tier allotment and dupe the user into thinking they are actually getting something for nothing. But in reality it follows Comcast's philosophy of "pay more for Less". All it really is good for is to deliver ads faster to your browser for those that don't use a host file or ad-blocker & maybe an occasional small file download if the 'Protocol Agnostic' crap doesn't kick in and time you out so one has to restart their download a few times.