I've heard nightmares (leading to two fixes in less than a month) and of course, Apple touts its coolness.
First thing many of us with 16 GB phones see is that there is not enough available disc space. The choices are to delete and/or move some stuff if updating over-the-air, or to go through itunes on another computer connected via usb to the phone, so the temporary space needed for two operating systems on the phone is bypassed I assume.
On machines with the option, I don't play no stinkin' itunes!
If I decide to bite the bullet on the new OS, I'll probably just dump my music temporarily, as that's my biggest space hog.
Just curious as what the rest of the TSB iphone nation is doing.