I have been using this product for over a long time and also gifted it to one of my friend and believe me when I say it . It is and was one of the best in the business.
Still it does not laggs at all and apples excels at keeping it just simple and as it is. Very good phone the fingerprint scanner is a breeze to operate very well done by Apple coupled with ios 7 this thing is a beast in its own. The metallic body is icing on the cake!