I know this is an old post but I have been trying the Nitro app on an Android box - it has only been a few days but it seems pretty good.
They have network channels ABC, CBS, NBC and Fox for a lot of different cities - not just Boston and Seattle but cities like Miami, LA, Detroit, Philadelphia, New York, Chicago, Dallas, Houston, San Fran, Pittsburgh, Sacramento, San Diego, Kansas City, Orlando, Baltimore, Washington, Minneapolis, Denver, Charlotte, Phoenix plus a lot more.
They have all the Sports packs - NFL, NHL, NBA and MBL.
Their Video on demand look pretty good and picture quality is good on most channels.
I only have a trial - but if there service is like this all the time and continues it could be a good one.