Great stuff most everything seems to be working very well (GPS, calls, audio, data, wifi, camera) with some minor hiccups:
GPS works great, very fast 10-20m lock, but no compass in Maps.
Camera was laggy at first but after a reboot it seems fine.
Auto-brightness is acting weird. Pretty dim, then it randomly gets very bright and doesn't dim again until I play with the setting?
Pretty sweet overall though I do see only about 145 free RAM on boot after I'm all set up. Perhaps it will 'leak' less than ICS? My config there had ~190MB free on startup but had to be restarted every 1-2 days after it all filled up irreversibly.