just wanna share my experience here. I got my Iphone4 from Digi Johor. After few months of using, the home button become not responsive. I feel like lazy wanna go all the way to digi centre since im staying quite far from digi centre and plus i heard digi not going to replace unless ur iphone home button is fully failed. Recently i came to UK for holiday and saw this apple store. Just trying my luck just advice them my issue and they book me for an appointment. Few mins later a stuff from genius bar came and she pressed my iphone 4 and its only fails 2 out of 10 times. She said well okay, u r not happy with ur home button so we gonna change another iphone4 for u but do u have ur data backup in ur computer? After sign 2 forms/agreement then she took a refubrished iphone and after i checked everything was exactly new and i;m more than happy to get a 'like new' iphone, since my old iphone has visible scratches on the bezel due to the stupid bumper. My model now is MC603B instead of MY.. my conclusion is apple store customer service in UK is far better than malaysia!