So just wanted to write this review to say that it makes some weak headphones sound amazing as well!
 
I just sold my hd800 today. Without it i thought I might as well sell my wa7. However I got this idea to try these wa7 to with my hd598.
This never cross my mind cause the hd598 is too low class for the wa7 i thought. But since I don't have any other headphones to plug into the wa7 with (besides my bose 25 which is a obvious no), i tried it. And it AMAZED ME! My sennheiser hd598 sounds better than then HE400. I don't know if thats still worth it as wa7 is like $1400 (tube power source). But it did made my hd598 go to another whole level (as it did my hd800 as well of course but more noticible on the hd598 actually)
People may disagree but these are purely my opnion

I think the sq is good but personally i dont like flat sounding headphones.

It was just alright. I wanted to look for something close to hd800 soundstage but cheaper. This one did not do for me.

If you are new to headphones this is the one to get if you also don't want to spend too much!

I personally think it has great sq and all. but compared to my bose 25 its not better imo. And bose is much more comfy and much more sound isolated. 
But this could just be my opnion. And i have only had this for 2 days.

Im not good at reviewing, but its the best sounding headphone i have! I must say that although not all my friends think these are worth it, everyone can tell that its better than my hd598

Well, I just got into head fi. I must say my first impression was just okay.
Then after using it for over 300 hours I could start to tell its superiority in sound quality to my bose qc 25..
Also it is very comfy. the padding is not as comfy as the qc 25, but because it is an open headphone i.t allows alot of air to breathe so I NEVER sweat with this on, while I do sometimes with my qc 25 when walking around on a hot day. 
But when compared to the hd800 it pales in comparison. But thats to be expected, cause hd800 is like 10 times its price.
Very worth the 150 dollars though!