[MattTCG]

For me, it was my Beyer dt 990/600. They were just fun to listen to and the comfort level was off the charts. Even when I didn't really feel like listening, I could still listen to them. 

 

[TMRaven]

Their cups were a bit too shallow for me.  Their sound was amazingly clean though, and even though they had a very large treble spike, it wasn't ringy or strident.
 
I guess mine would be DT990 600Ω as well?  Because it's only one of the two headphones I've sold so far and I couldn't care less about M50.

 

[gtrslngrchris]

So far I miss my HD598s the most. I don't think they were my favorite headphone but they were just such a comfy and fun headphone.

 

[draven5494]

My Q701s.  
 
So much so, that I just purchased another pair today...

 

[MattTCG]

I sold the hd598 but don't regret it that much. I liked the mids and treble but just not enough bass for me. Super comfy also...

 

[Mad Dude]

Sennheiser HD600. Worst decision I ever made in this hobby. I started looking for a headphone that sounded like the HD600, just a little better - I could find none. Now I'm once more a happy owner of a HD600, and also added a HD580 to my collection.

 

[Fearless1]

Pro 900s, owned about two days, hated them. I understand now that two days is not enough time to judge a brand new pair of HPs.

 

[roma101]

KRK KNS-8400 and yes I repurchased them.

 

[MusicTurtle]

My DT770's I upgraded to the DT 880's and hated them. Now I need to buy another pair which would make it #3.

 

[MattTCG]

Quote:

Sennheiser HD600. Worst decision I ever made in this hobby. I started looking for a headphone that sounded like the HD600, just a little better - I could find none. Now I'm once more a happy owner of a HD600, and also added a HD580 to my collection.

 
A better title might be hp's that you sold and then bought again...

 

[formula1]

Quote:

I sold the hd598 but don't regret it that much. I liked the mids and treble but just not enough bass for me. Super comfy also...

 
Bass is not everything. 

 
I sold my porta pro's. I miss them, they were fun little headphones. Im buying them again 

 

[TMRaven]

Bass is something 95/100 of open headphones on the market lack.  

 

[Curly21029]

Quote:

 
A better title might be hp's that you sold and then bought again...

 
I can get behind that.  I also sold the HD600 only to re-buy both the black mesh and silver screen versions years later.

 

[MattTCG]

I keep hearing people talk about the enjoyment of the hd600. It's one of my gaps in hp's that I've wanted to own. Maybe it's time!!

 

[Canadian411]

For me, it was my Beyer dt 990/600. They were just fun to listen to and the comfort level was off the charts. Even when I didn't really feel like listening, I could still listen to them. 

 
Me too, I hated it, ear piercing trebles but I sold it half price in excellent condition
The reason I want it back is exactly what you said, it's fun headphone, just have to figure out how to reduce the trebles.