Made the plunge this week.

Increased speed > loss of add-ins, some of which are in "beta" development (e.g. TinyURL Creator)

Trying to stay lean on the add-ons:

Adblock Plus (essential)
Coupon Craze - Coupon Notifier
Download Statusbar
DownThemAll! (essential for mass downloading)
Foxmarks Bookmark Synchronizer (essential for multiple computers)
IE Tab
Link Alert
Stop Autoplay

Has anyone ever looked at the IE add-ons? What a fucking joke.

Edit: added Screengrab!