I had the same issue...decided to DVR the NFL airing of the game instead of CBS. Ended up recording the Packers game. After 15 minutes of cussing at NFLN, I decided to buy the NFL preseason package (which after a coupon code I found online ended up being $14). I would definately recommend this to people who missed the game or don't get the games where they're at. However if you're in market and the home games aren't sold out, you will be unable to watch the games live.
Edit: You also get to pick your broadcast team.