While I am a Rockets fan, I like to follow the three Texas teams, so I consider additional "value" in being able to watch Spurs games through the subscription and Mavs games through the local broadcast.
On top of that, as was previously noted, if you are just a fan of the league you can find a game each night to scratch your itch. My wife once caught me watching Timberwolves-Kings a few years ago, however, so be careful.
Also, unless it is a full slate of games on a given day, you should have the option to view both the Home and Away broadcasts. It's a nice touch when the Rockets are on the road.
One thing I would add, however, is to analyze your channel lineup or call DirecTV to verify the number of HD channels they provide.
I have used Time Warner Cable for each season order and they only provide one channel of HD broadcasts. It's probably not going to be a deal breaker for you, but it is a factor to consider.
Hope you order it and enjoy it!!!