hello im newbie here,just wanna ask u all whether the NW-E002F/B good or not? coz,im considering to have one,but dont know it is good or not. 1st:how many songs can a 512 MB saves? 2nd: is it real that it can be played for 3 hours by only charged for 3 mins? 3rd: does it have the same function between all the colors? i mean does it have different function between the black one and the blue one,between the blue one and the pink one ,and so on? thanks