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I ran iOS 6 betas on my own 4 prior to selling it and getting a good deal on a 4S, and found no performance issues compared to that of 5.1.1.

I've also installed the public release of 6.0 on my wife's 4, and it's no worse off then 5.1.1, so performance wise you have no problems or issues to be concerned with.

What I would say is that the 4 gets very few of the "major" features, such as Siri, Turn by Turn, Flyover, etc. However, Shared Photostreams are an excellent addition for sharing shots and memories with loved ones or selected friends in a private album.

This feature has proven invaluable in creating a shared album of my newborn niece, which we can all contribute to as she grows up, safe in the knowledge it's on iCloud.

Hope that helps.

What software/hadware do your 'friends' need for sharing your photostreams?
 
What software/hadware do your 'friends' need for sharing your photostreams?

A compatible iPhone and iOS 6 on all devices.

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DO NOT TRUST THE CLOUD.

One screwup at Apple and your photos could be gone, never to be seen again.

Save them all on your OWN media. Burn them to DVD. Don't trust another party to be the custodian of YOUR data.

MobileME was shut down. Who's to say iCloud won't be next in five years? Save and back up your own stuff; use the cloud only to share it.

Sorry for ranting, this is a big issue for me. :) People put too much trust in "the cloud".

Yeah, that's true. Appreciate the reply.

I've got a hard copy of the album on iPhoto too, which runs on the internal drive and is backed up to the external.
 
DO NOT TRUST THE CLOUD.

One screwup at Apple and your photos could be gone, never to be seen again.

Save them all on your OWN media. Burn them to DVD. Don't trust another party to be the custodian of YOUR data.

MobileME was shut down. Who's to say iCloud won't be next in five years? Save and back up your own stuff; use the cloud only to share it.

Sorry for ranting, this is a big issue for me. :) People put too much trust in "the cloud".

I could not agree more!
 
I had no problems with ios6 on my iPhone 4. A few apps didnt work properly but they were soon updated. The phone feels much faster than ios5.1.1.
Battery life has been good on 3G (but I rarely use location services).
The only app which takes longer to load is the music app (compared to previous iOS versions)

Overall the update makes my phone feel smoother and almost like a new phone
 
I had no problems with ios6 on my iPhone 4. A few apps didnt work properly but they were soon updated. The phone feels much faster than ios5.1.1.
Battery life has been good on 3G (but I rarely use location services).
The only app which takes longer to load is the music app (compared to previous iOS versions)

Overall the update makes my phone feel smoother and almost like a new phone

First launch of the music app after a sync is slow, but afterwards it's nice and fast. Try again? :)
 
DONT INSTALL IT on the iPhone 4 - it lags terrible after that.

Even the keyboard, when you are typing a sms, dies - often i write and nothings happens and suddenly it appears... Lags like ****.

App store same expierince.

It doesn't lag that bad for me but it does slow down the phone for me and it tends to lag slightly in normal usage. Games that used to run smoothly now lag a lot more. Anyone else have this problem?
 
It doesn't lag that bad for me but it does slow down the phone for me and it tends to lag slightly in normal usage. Games that used to run smoothly now lag a lot more. Anyone else have this problem?

No I actually find games faster but RAM usage of other is really high, over 100mb this results in crashes
 
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