I have here a pair of Beyerdynamic DT250. They're actually surprisingly very nice sounding. Contrary to what most think when they think of Beyerdynamic headphones, the treble response is really smooth here on the DT250.About the mod: I followed a guide from a site (that, I believe, cannot be named here on Head-Fi) that balances the well-known channel imbalance that's on these headphones. The imbalance is due to the non-perfect seal from the plug going into the left earcups.The headphones are in very good condition. There's a small mark on one of the earcups. The stock earpads look alright but I'm not sure how the new pads are. The circular tuning foam that goes over the driver disintegrated so the two tuning foams won't be included. I have attached a pair of fake Shure SRH pads - I really like these pads because they have the right foam density, thickness, and ear opening for a more balanced sound on most headphones I've tried them with. With the stock pads, the headphones are very mid-centric sounding. With the fake Shure pads, the bass is brought up a bit and evens up the midrange.Let me know if you have any questions about the headphones!