.Pixote. said:You don't need to go into the Vault to finish the game. But the Vault does have some juicy stuff.
If you get in peacefully as a citizen, there's a great free doctor. But since that's not the topic, you can still get a lot of ammo, some metal armor, the red memory module, books, medical supplies, basic weapons, general sellable loot...
Yeah, going in is a good idea.