Well, i had flashed adfad's jb along with the full 86mb gapps on sdext using tassadar's method. I have a 800mb partition, do space wasn't a problem.
Things i liked:
- lockscreen. Come on its not sooooo great and any themer can port it to ics.
- transitions. Especially those when opening apps from launcher, when the app zooms from the icon u clicked.
- Iphone style back button in top left, in settings.
Things i disliked:
- status bar. It's like the tabletui in ics. No toggle buttons. I don't care about the rest.
- default app chooser (the dialog u get if u click a link and have more than 1 browser installed). The ics one is pretty straightforward. Only a single click and it opens. In jb, u require two clicks.
Google now doesn't even open. It just shows a white screen and then closes, without any fc. so i couldn't test offline voice search. Graphics is extremely laggy. i think ics ardeno drivers didn't work with jb, and don't ever think Qualcomm will e'er release them for us.
If such is the situation,i don't think there's any point in developing jb