CyanogenMod 9 on Samsung Galaxy S2.

The new CM9 nightlies are now good enough for me to switch over from CM7.

Very much better battery life (c. 50% more at present, e.g. 15 vs 10 hours) and I'm liking the new Android 4 interface (ICS / Ice Cream Sandwich), despite it breaking lots of the UI patterns learned in Android 2.x.

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