Sure there are things that don't work but thats cause its a beta. But here are my thoughts:
Love the new look of calender and messages. (New fonts, cleaner look)
New Media screen!! Nice look and touch!!
A2DP!!!! Been waiting...love it!!! Except it doesn't work with video (yet..maybe it will)
Have been using my Motorola S9 headphones with this OS and it doesn't cut out between songs like some people have said..not even on shuffle!
Love the new cursor on the mobile browser...better than moving a highlighted text down on something.
Haven't had any errors or reboots yet and have been running this OS for 3 days.
Actually wait the above is not correct...like previously stated the camera doesn't work as soon as i take a pic it doesn't save and the camera closes..but i can live with that for now until the final version comes out.
Quicker reboot...turn on.
Overall a vast improvement!! Can't wait for the final version!!