honestly i had ordered the rockerz 400 first and they didnt seem that great but then i asked for a refund and ordered these 510 in blue and even though i was sceptical about it at first im glad i went ahead and purchased it because the headphones have great bass and sound and the battery backup is just amazing i charged them 2 days ago and i use them w bluetooth for atleast 3 hours a day and they are still at 90 or 80 the cushions for the ears are mindblowing they are so soft and com