- I appreciate Project Butter as a long time iPhone user and current iPad user. Apps open and close absolutely instantly without any stutter or delay 99% of the time. It's the same with the home button, the app drawer, the multi-tasking menu.. it's easily noticeable where Project Butter is working. I think the animation when you tap to open a folder takes too long though; it's inconsistent with how fast everything else is and makes it seem like it's lagging. It's also disappointing when a particular app is still a little sluggish when the rest of the OS isn't hardly at all, but oh well.
- Apparently driving mode will transcribe your incoming texts and emails, etc. and let you dictate responses somehow. I haven't put it to use yet.
- Good Now is nice, but it should be accessible from the lock screen by default. I love the way stock android does it, with quick access the Google Now and the camera. I've turned it on though and will see how it helps me in my daily life over the next few weeks. Google Now can be accessed with a long press of the home button and then a tap of the middle icon. On the home screen it can be accessed with a long press of the menu button. A long press of the menu button will always access search in whatever application you're in. Google Now can also be accessed from the Voice Search icon. Google Now replaces Google Search, so anyway you could access Search will now bring you to Google Now.
**I'm not sure how much battery Google Now will draw yet, but if you're battery conscious you can go into Google Now -> Hit the menu button -> tap settings -> tap Goggle Now, and you'll get a list of all of Google Now's functions. You can disable them and their notifications individually. For instance the weather notification is on by default. I bet that draws a bit of power, so I disabled it.**
- There are little changes all over the place. Some are Samsung TouchWiz changes, some are Android Jelly Bean changes. The notification bar, along with its changed appearance allows you to expand notifications with a two-finger drag down. There's more to play with in the settings like a Do Not Disturb mode. The menu button has more options in most places.
- Battery life seems to be the same so far.