Stolen from the XDA Forums member taimurniaz
I'm going to post my impressions of the JB update so far. I've got an
unbranded Taiwanese HOX.
When you turn your screen on the animation is really smooth. I didn't use any other screens before and I haven't checked others now as well, but the productivity lock screen now shows the current weather as well
- The pane switching animation has been altered slightly. It was sluggish at first but now it's back to being smooth, however, it's a bit slower than what it was like on sense 4.1
- The entire colour scheme has been changed to the native android blue. There's a mixture of the sense green and android blue throughout though which is nice
- The notifications pane has been updated and it is now VERY SMOOTH. There's also an option to activate the power saver mode. Various options such as battery, apps and beats audio etc have been altered.
- The gallery app has been updated featuring two different views
- There's a different animation when opening threads in messaging. This feels a bit sluggish compared to the old one. One thing I don't like is the new sense keyboard. It's great that they give you the option to remove the arrows but the layout has been altered and I'm having to relearn how to type on this
- I'm still unsure of whether battery life has improved. I can tell it hasn't worsened but still haven't done much to see if it has improved
- By far the biggest improvement is the browser. It has a cleaner interface and is much quicker. Fit to screen works brilliantly with almost all sites now! Chrome is included by default but I found no reason to switch to it, the default HTC browser is good enough.
- Voice search and Google Now are now available. I really like using Google Now, it's good at reminders and giving sports updates!
- The camera has a couple of new shooting modes
- Switching between apps is now a bit quicker BUT I do feel that opening and closing apps is a bit sluggish now
- The beats preset has been altered and it is now louder and much better