Sony walkman is a wonderful product. I have used the 4GB variant. Its very user friendly and it can be easily charged using the phone's charing adapter as it has a usb head. The same usb head can be used to get songs from a laptop or a PC. The audio quality is awesome and so is the battery backup. Several attractive colour options are too available ( I had used the golden and black one ) . The brand provides one year warranty and provides a sealed warranty card at the time of purchase. Usually one doesn't require a servicing before a year because afterall it's Sony. The product comes with a 3.5mm jack ( which is standard size of all headphones in Indian market) .
In a nutshell, I want to say that blindly go for this product. Its the best in the market even now