About "Download Additional Content"

Upgraded from Logic 9 > Logic X and finding my way around.

I have all the Jam Packs and the Legacy stuff already from Logic 9.

When I checked out the "Download Additional Content" I see a lot of stuff, like...

1. Drum Kit>Stereo Drum Kits>Songwriter>Alternative>Rock Kits>R&B Kits: I assume that these are needed for Logic X's drummer, yes?

2. Multi-Output Drum Kits

3. Producer Patches

4. Mallet

5. Orchestral

6. Apple Loops

7. Reverbs (Stereo "incomplete" and Surround "installed")

Is this all NEW content to enhance the functionality of Logic X??

It comes to about 22-33 Gigs so I would like to be sure before I go ape-**** download crazy.

Thanks!!!