The phone overall is much faster. Smoother scrolling (both in the app drawer and between home screens), and apps open much more quickly. Standby battery life is much, much better. But if I use the phone a lot, it still dies as fast as it did before (for me, using it a lot means hundreds of texts, a couple hours of web browsing, a few games, and I have two email accounts that sync every hour, and then five gmail accounts (push), and one activesync account (also push)), which is about 10-12 hours of 'heavy' usage for me.