I've had the update for a bit over a week. Not great. Much more negative than positive.
On the positive side:
* I've had no "Can't Send" issues since the update -- which were extremely frequent for me previously. I'd claim the update fixed it, but I've seen others post that they still have it. I'll knock on wood...
On the negative side:
* I've had one random shutdown. I pull the phone out of my pocket, and it's off for no reason.
* I've had a couple times where the phone heats up and the battery drains rapidly. A power cycle fixes it.
* I've had a couple times where Wifi can't find any networks. A power cycle fixes it.
* Once, my phone shut down due to critically low battery. But upon reboot, the battery app showed 32% available.
Arg.