I am using Sony Walkman B Series 4GB from 8 months. it is awesome MP3 Player. Its bass booster feature makes it unique. It has also 5 band equaliser. It has long battery backup. If I charge only 5 minute then I will play 100 minutes. It has 4GB in-build memory which is enough for MP3 song. It has a small LED Display which shows track name and number. overall its all function is very good. I like it so much.