Observations... moving to .99 from .90:
~zero reboots since installed yesterday morning.
~'funky' symbols (ie; the 0 had stuff under it) on phone dial pad gone - during call.
~consistent 'dialing sounds' have returned. (inconsistent in prior OS)
~when I lay the phone my desk; in portrait mode, it stays there. Same with landscape mode. (used to switch and stay in Landscape)
~gps satellite discovery seems faster in both BBMaps and Nav4All.
~seems to be little/no difference in speed of accelerometer. Snappy... about 1 second.
~DOES seem to move between screens a little faster. ie; email screen to home, contacts to home, etc.
Just my $.02; YMMV
"...lesson learned and the wheels keep turning..."