The advertisement itself shows Boston's historic landmarks with average every day citizens speaking of Tom Brady. They tell stories of Brady throwing a football across the Boston Harbor, the city and fans actually getting younger with each championship, children having to be legally named "Tom" or "Brady", and finally that we should enjoy him while we can... because he'll "only be playing nine more years".
Droga5 Studios and Under Armour definitely took a risk in paying for the advertisement and getting it filmed and created before the Super Bowl. However, the risk paid off and allowed Under Armour to get first advertisements into the market following the Super Bowl. Tom Brady is one of Under Armour's most highly touted athlete and should use his success to further promote the brand.