CM11 now brings the latest, bleeding-edge Android 4.4.3 to Galaxy S2 GT-i9100 officially, straight from the CM team and the SGH-i777 ported from the official as it’s nearly identical in hardware specs.
Out of the box, you will feel the faster performance that Android 4.4.3 brings to the table and even Antutu benchmarks show nice 20% improvement over older Android versions.
Of course, that’s not all, you can expect much better battery life with Android 4.4.3 custom ROMs.  All of this without upgrading your phone or hardware?  Yes, it’s a win-win situation for Galaxy S2 users and you can get it today instead of waiting on carriers to update their software (and Samsung has completely stopped support for this phone long time ago).
Overall, Android 4.4.3 is certainly near flawless with the latest CM11 ROMs so definitely give it a twhirl this week(end) and do let me know how much faster your S2 runs!

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Download:
Download Micro Gapps (Don’t use regular Gapps!)
For installation, please follow How to Install Android 4.4 KitKat ROM on Galaxy S2!