These are very good headphones which have similar sound with the beyerdyanmics DT770. However, when u first put them on, you'll be greeted with extremely hot and harsh treble, very weak bass and less than satisfactory midrange. These qualities change however, and i find them refining after 2 weeks of use. These have very good synergy with the Fiio E5 and E7 since they offset the recessed mids. one more thing to note is that the details that these put out are real details, not like the RE0s which i find having too much of a faker detail retriveal by highlighting the high trebles. Im not saying the RE0s have bad detail at all just that the treble sounded a bit wierd to me. In all essence, if you're not seeking high end Stax equipment, and like most mortals have only around 200 to burn on audio products, get these along with a fiio E7!