I think my cable package automatically includes NBA TV (I didn't subscribe to it, but I get it somehow). I think their programming is the worst of all the networks covering the NBA - and that includes TNT which is also atrocious.
aa
NBA TV is included on many cable packages IIRC. It's not the same as NBA League Pass, which shows every NBA game being played in live streaming. Exceptions are games being shown on other channels which you may have access to, such as TNT or NBA Network.
League Pass picks up the local markets' feeds, so you can generally watch either the Cleveland channel or the Golden State channel, for one example, assuming that is the game you're interested in.
I've been a big Dallas Mavericks fan for the last 25 years or so, going back to when I met my wife who has been a fan longer than I. The Mavericks aren't doing well these days, but in the meantime I've just become an NBA fan in general, and I've subscribed to League Pass for about 5 years. It's fun to compare the play-by-play and color announcers in the different cities, among other things.