I have just upgraded my Samsung Galaxy S3 to Jellybean 4.1.2. It seems to be much faster in changing screens etc. And I have seen an overall performance increase. Most Apps will load instantly. A few changes have occurred though. E.g. driving mode is no longer in the top menu. This is used with Bluetooth and reads out notification messages etc. I got around it by downloading a free widget from Google Play. There is also a new item called block mode, it allows you to I.e. block all calls except from certain contacts. Not something I would utilise but I can see it being useful to some.
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I think 4.1.2 is better than ICS. As it has a much better Predictive keyboard. It learns what you type most regularly and makes it a lot easier to type. With ICS I found that I kept having to delete words and retype them.
However I did find that this particular ROM was a bit Buggy. It used to crash the phone and I had to do a battery pull. There is a newer version out now which is JZ054K.I9300XXEMF1 that I have found much more stable the previous version was I9300XELLA. It is still 4.1.2 though. My phone automatically updated last Friday. And it seems to be ok.