After a few days, I can't see that it's that much faster than 3.6. Certainly the boot time isn't as impressively quick after a few reboots as it was after upgrading, not sure why. Laptop is a dual core T4300 2.1GHz with 4GB ram so I can't see it being my machine really.
Couple of nice touches they've added though, like being able to paste and search, as well as open links just by highlighting instead of having to C&P then submit them.