You get the local station advertisement (as if you were watching the game in-market), but you can switch to any other live game during commercials. It also includes the DirecTV Red Zone channel[0], which basically does that for you and tries to just show whichever games are currently at exciting moments. That's honestly one of the best ways to watch, because they just switch away from any games that have an ad break. Presumably it will be changing or going away entirely, since DirecTV no longer has the rights to these broadcasts.

There's also a "Fantasy Zone" channel for fantasy football stuff, but I've never actually watched that one.

[0] Not to be confused with the "NFL RedZone" channel, a completely different television broadcast that does the exact same thing, but hosted by a different dude.