The S3 is a fine phone...some peoples experience will vary, and honestly that's just a Samsung thing. When I say vary I mean towards things that have to do with build quality...Some will say their volume rockers are loose, some will say they are tight, the same goes for the power button. Honestly that's all I can really gripe about with this phone as far as build quality. Diving into the phone you'll find the call volume is absolutely superb ...Very loud and clear when talking on the phone, the loud speaker is also superb when listening to music or watching a video...basically blows beats away on the One X. The screen is beautiful and as a whole the phone just flies when doing any task whatsoever...Battery life is great also, As of now I'm averaging around 15 hours with some pretty good use, just a side note.. my first one was terrible on battery life, this is my replacement unit I'm using and its one if the best phones I've used as far as battery life goes.
If there is one thing I can recommend its to change the stock keyboard as soon as you take it out of the box, the stock one is a horror show! Give Perfect keyboard a shot, it even has an iPhone keyboard skin in the paid version. Good luck ...