I'll be quick:

PROs:
1. You get unlimited brands.
2. Each of your unlimited brands gets 10GB of storage space. If you use 10GB for any one brand, wow, that's crazy. Write some markdown and link to your Dropbox or whatever for your video files.
3. Performance is fast.
4. You can upload different fonts files and contextual explanations for their use. You get a font preview.
5. You can upload a ZIP as a font package also.
6. You can upload SVGs, and you can change the fill colors for download. This doesn't really work for multi-color SVGs in the sense that you can't select individual fill colors in your SVG. You need an app to do that. Fill black and fill white. Perfect!
7. You can upload an SVG and people can download a PNG. If you update an SVGm you don't need to upload new PNGs to match.
8. You can upload a Sketch or AI file.
9. After you add you brand colors, the user can just click to copy them. It's just plain handy.
10. You can lock down your workspaces. If you don't want a brand to be public, not problem.
11. Each workspace is branded for the client brand. You replace Brandy's logo with your client's

WISH LIST:
1. Cnames. They're coming.
2. When you click on the logo at the top of a workspace, it links to Brandy's website. I'd prefer that go to my client's website.
3. I'd like to toptoon to select a new button color in Brandy; to use a client brand color of the buttons instead of Brandy orange.

SUMMARY:
There have been other branding deals on AppSumo. This is definitely the most generous, and it's not close. Also, the way it presents content is easy to understand and use. It doesn't get wrapped up in its own flash. Your clients won't ask how to download their logo or a font. It's intuitive.

I really, really like this one.