This is the first time I do write a review for any product online. I do share my experience with Arc S, Awesome mobile with great performance.
The 1.4GHz processor is one thing you note it, If you compare with Samsung S II, It beats the performance of it. You can feel the single core power worth using it, Camera is worth the clarity. Sony ericsson comes with the Ice cream sandwich version of Android by March 2012 officially. This is one of the handset which is ready for the upgrade.
You can also play all kind of video files if you install MX video player through android market. And also you have timescape navigation for all integrated social networking websites.
The main drawback is the front facing camera which is not available.