FWIW I've found my current Treo 650 no more or less stable or finicky than my BB 7100t which now sits in a box (b/c the keyboard/text prediction sucked IMO - too many 2 and 3 letter words which share the same key combinations, eg. hey and get). And yes, my 7100t was using the latest firmware.

Both devices would hang every now and then. I'm considering the 8700t to replace my Treo 650 if it proves to be about as easy to handle physically and is materially more stable than the 650 and 7100t.

TM