Go easy with the burn-in...mine died after two days (right driver ist tod). Otherwise I'd be all over this thread, lol. I was burning them in with pink noise and high frequency sweeps and techno music, with a five minute rest every hour. Not driving them hard, just a little louder than listening levels. Fine one night, dead that morning. Out of the box they were very bright, but only an hour or two of break-in and they were sounding great.
Replacing them was easy however...the place I bought them from were out of course, so they referred me to Pete Carini, Beyer US's customer service rep. I called him, explained what happened, and he said no problem, send them to me and I'll replace them right away. Done. The amazing part is I told him that I really needed them asap, because I was leaving on Thursday, and they were to be a gift (I'm hoping my father in law doeswn't like them though, because I do!). This was on Monday. Pete sent them via UPS on Tuesday, and they are due to arrive tomorrow...two day air. Not a cheap shipping method, but he wanted to take care of his customer, an dI truly appreciate his going the extra mile.
I also got the ESW9A's recently, and I really like them both. Polar opposites in nearly every way, but they both sound fantastic. It's very hard to go from one to the other though, lol. After a little while you get accustomed to the sound of whichever phone you're using and they sound fine. Yes, the AT's are much warmer, darker, laid back, and slower while the T50p's are fast, bright, and clean/clear. I think they both have their niches, but if I had to take one or the other, I'd stick with the Beyers.