Actually I am a very heavy user of smart phones. I am always doing surfing, gaming, chating with my phones. When I was buying this product, I was not very sure about it’s performance, but after using this product for last 9 months, I have to say that Samsung has done a great job with it. No lag or hang ussues at all. Camera and speaker quality are nice. I have checked all high end games like Asphalt 8, N. O. V. A 3 with it and it has performed very well.