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I posted another thread about this on Sept. 19th asking people how it was on the 3GS,
https://forums.macrumors.com/showthread.php?p=15764474#post15764474
So, this is my followup. Wondering how it is now, after a week of use.
Thanks!

I installed it 5 days ago on my Mothers. The one thing I hated about the 3gs was lag on iOS5. It is better on iOS6. As you know some of the new features are not available. I think it is worth it to lose some of the lag.
 
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