just a quick word, after much deliberation, and thanks in part to this thread, I pulled the trigger on the M500 a couple of weeks ago. I had a problem with the cord jack in the headphones... had to insert, then push really hard to get full sound in both ear pieces. I listened for a few days to decide if they were worth an exchange over a return and decided to get a fresh pair! The second ones arrived in a couple of days (Thanks Amazon), and have no issues with the jack. The fit, however is a little different than the first pair I received. Pair 1 was super plush/soft and felt light on the head, pair 2 was equally plush feeling [very nice, and super soft leather/pleather ear pads on both] but felt slightly heavier on my head and had a bit more clamping pressure. No issues with fit on pair 1, except maybe a bit too loose. Pair 2 gave me a little discomfort after a long session (wearing glasses)., not enough of a difference to swap them for a third pair (yet) but I thought I should give you guys a heads up. There seems to be a little variance with the quality control of the current run, I think they might have pushed it to meet demand...
Sound-wise they are consistent, and VERY capable. They seem neutral, and natural. Nothing jumping out and true to the recording. (Listening straight out of a iPod 5.5g, Nano 6g, and iPad)
Sound isolation is not as bad as I was led to believe from earlier comments in this thread. No leakage.
I think they are going to be keepers!
Thanks MH and friends, (for their intended use) the M500 are working out great!
Cheers
FM