The 50mbps might not serve to be very useful for a single user, but when you've got a household with multiple users [computers, xbox, etc] accessing larger sized content, I'd imagine the added throughput could serve to be useful.
And even if not the downstream, the 20mbps of upstream would be a very nice step up from the average upload speed of most connections. Uploading any large sized file from a 512kbps connection SUCKS.
