AeroFS isn't as refined as Dropbox, but the flexibility of cross-computer sync makes it pretty ideal for large media storage. I have almost 200GB of photos, and dropbox really wasn't an option for that. They release updates to the product every few weeks, so it's getting better.

Gripes: 1- It's a lot chattier than dropbox. This could be a tradeoff for being a distributed protocol, but it's something that dropbox seemed to improve in over time as well. 2- Iffy compatibility with Lion: I often get "AeroFS is already running" messages. 3- They recently added the needed ability to change the location of the AeroFS Library, but I'd love to modify the location of each Share in the Library. 4- This is likely beyond the project's scope, but I'd love to be able to access my files without syncing in a pinch. 5- Better activity view: Dropbox's menu icon changes to indicate activity. I find this useful, so I can shut it off if my connection is slow. AeroFS's icon doesn't change, and to view activity, you need to open Preferences.

Positives: 1- Unrestricted size, great for large media libraries 2- Seems very fast, especially over LAN 3- I love how you can set up multiple shares - one for a workgroup, one for personal projects, and one for photos, and you can sync those among any computers you want. 4- It makes offsite backup effortless 5- Auto-updates are great