I have had a pair of 555s for several years - they are great if you are plugging them into a receiver, but they work well even without a high-quality source (this is the reason I went for them over the 595 or 600s etc) The higher-end models do sound much sharper and better - however they require an external headphone amplifier to draw out their optimal sound.

In short, my 555s have made me quite happy and I am able to either use them with my stereo system or with my laptop.

edit: keep in mind though - their open-air design helps to open the soundstage, but it also leaks quite a lot. If people are sleeping in the same room and you want to play loud music they can hear it. If they are in a different room you should be fine.

Last edited by schizm42; 12/04/09 05:04 AM.