In short, here are the reasons you should upgrade to the new version of Dropbox:
- Thousands of bug fixes
- Huge performance enhancements, including faster syncing and 50% less memory used
- Better user experience, and a rewritten client based on Cocoa
- Selective Sync for everyone – not just the beta versions!
- Extended Attribute Sync – including forked file data!
Also check out my article which allows you to always find the latest versions of Dropbox (both RC and Beta)