(surprised this thread took so long)
I'm personally not upgrading until Google Maps is available, I use the Transport feature quite a bit. That and there's not much reason to upgrade.
But...
I just had a play with the maps and the 3D mode **IS SERIOUSLY AMAZING**. My jaw dropped. At least in the areas around Sydney I panned around, city to eastern suburbs, every single building was in 3D. And the detail completely blitzes Google Earth. All the trees including down to a 6ft palm tree out the front of our building was rendered in 3D. All the tiny details of the building ...it has to be down to sub-metre resolution.
It's flashy and useless I know, but nonetheless hopefully points to the future direction of the 2D maps.
The parts of Sydney I panned around are on the same level as this:
I would hold off for a long time. Maps is useless. YouTube has disappeared, and you find your battery dead by lunchtime. Rubbish. Yet to find a real improvement really.
And it does something weird to the Bluetooth in the car where you have to set up the music and hands free seperately.
Yeh I thought my battery life on iPhone 4 was crap, now with Ios6 it seems way worse.
I've got the YouTube app and its ****. Really silly layout and no onscreen volume control ect.
Had my battery at 38% at 130pm ( which is ****e in itself)today, I used it to check email once and made one 2min phone call. Pulled it out of my pocket at 3pm and it was turned off dead. I'm thinking its lte connected issue. I'm turning lte off tomorow and will report back the results. If its not related to lte I'm takin the sucker back to apple.
Ps I've done EVERYTHING possible to reduce battery suckage. So this will be my last attempt.
Seems like mine was solved with the "reset all settings" option. Did that and then emptied the battery and recharged it. I've had the phone on and been checking mails and SMS's and its still on 99% two hours later. Before it would be flat in 4 hours.
There must be some old app setting that is creating havoc. Reset all settings doesn't erase your data or apps. Just resets some default settings like wifi, etc. you also lose your lock screen photo and home screen photo so don't panic after it restarts.
Photo Stream sharing looks good. Didn't notice it before.
New photos of kids now just appear on interstate grandparents' television. Don't have to talk to them.
Really disappointed in my new iPhone5. Ios6 is not a great step up from my last iPhone. The maps are crap, the battery only gets me to mid-day, the back of the handset is always dirty (preferred the glass), and the browsing and screen is crap compared to the GalaxyS3 (to thin). Wish I had bought the new Samsung or HTC 4G handset..... 
