I'm pasting in here what I put in the direct tv thread the other day since it applies here:
Years ago I got rid of cable as I was tired of paying a high bill per month to have all of these channels I don't watch just so I can then pay more money for Sunday ticket on top of that. Since then I have been streaming all of the sports I watch from my laptop onto my tv. I have not one time got a virus on my computer. If you have anti virus you'll be fine. I suggest using Firefox and using Adblock, any popup add on they have and noscript. Noscript is nice because you can manually at the bottom right hand corner of the screen choose what you allow to be displayed. Just allow what is needed to view the stream and block out everything else. The first time you go to any site you'll have to allow things but it's not a big deal. After that first time it remembers each site you went to. As others have said the quality is not going to be as good as if you were paying but for the money you'll be saving by not paying a cable bill and NFL ticket bill it is good. I watch nfl redzone, baseball, hockey, basketball, anything. I'm watching the World Cup game now. I have not had many times over the years where I had to switch streams. I use only these two sites below and I have not missed anything yet. First row also has streams of espn and nfl network going at all times. Also, these two sites have not been closed down since I've been using them and are pretty reliable.
www.vipboxam.co
ifirstrowus.eu