Source control and Unity packages?

When using Unity with Git (or any src control) and you import packages from the asset store (e.g. SteamVR plugin) into your project, do most folks check the package into your repo? Any additional files to add to the .gitignore for packages?

 

I don't check imported assets in the repository but i never have them inside the project folder either.
If you see yourself needing the original package from time to time sure check it in.