i'm back.
Flashed to jp3 and got it rooted as well.
My take on jp3:
It is still a beta rom, so expect a bit of bugs here and there.
Flash is working.
Internet surfing is faster.
Screen capture available (holding back button, wait for the 2nd vibration and press home)
google contact groups in phone can sync directly with the gmail.
Fast, with little lag and more responsive
Icons are colored
Option for OTA updates
Google search bar with voice tts
New horizontal calibration (presumably for your sensors)
Pull down menu now got five selections: wifi, bt, gps, silent and rotation lock
New Device Administrator menu (don't ask me what this is, cos i don''t know too)
Swype is updated to 1.64.41.9192
Flash works tho need to install again
Bugs:
Haptic same regardless of settings
Black is not black in flash movies, clips
Cannot install google sky map
Clockworkmod does not work
update.zip will mess with the phone
root is read only for the system need to change via adb or root explorer
GPS seems to get a fix faster
Quadrant benchmark is about 20% increases.
available ram is 305mb, less than 2.1 which is 326mb
JP3 files are not deodex-ed. JP2 apps are all deodexed
Please don't ask me about more detail on gps, cos i seldom use it.