I was never an audiophile, I just knew if I didn't get these on sale while seeking a quality upgrade, I would always wonder. Now I won't go back. I ordered from the Newegg marketplace and had no issues whatsoever.

Incredible sound; Everyone I've shown them to has been blown away

You MUST have an amp for these; I was able to use them with the volume@100% on my phone, but it wasn't desirable; I knew this going in, so not really a con, just a drawback; (I do have an amp) If you don't have an amp you might want to check out HD598 or Audio-Technica ath-m50x

Sennheiser makes some very nice audiophile approved headphones. The HD600's are definitely one of their top products. A very nice set of cans that will allow you to listen to a wide range of music, without a fatiguing experience. Pros: + Impressive Sennheiser soundstage presentation...

With the extensive description on your site, I did not feel the need to do more research which I tend to overdue. I had a terrible buying experience a few times and vowed to never go back. I called the Help Center that Sonic offers to have a few questions answered about these headphones.

The HD600, HD650 and Q701 are in the same class of higher end sound. The rest of my headphones fall below. The next class is HD595 and ATM-500. I will say my QC15 are fantastic noise cancelling but with major quality issues of one side quiting out.

Out of all the headphones I have, I find the HD600 the most enjoyable; The HD650 are at times better but overall I enjoy the HD600 the most, I have SR-60, SR-80, HD555, HD595, HD600, HD650, AKG Q701, ATM-50, Bose QC15 and some various earbuds

There is always better; but these are great headphones

The HD600s are sound wise pretty much identical to their predecessor (the HD580s) but then given the audio quality with the older model this is no bad thing. Some might think these headphones are ridiculously expensive but in this case the buyer really gets what they pay for.

Great sounding headphones. These don't have exaggerated bass like some headphones out there, but have a very natural response across the frequency range. The response is smooth, and not tiring at all. I find the headphones comfortable to wear even after extended listening sessions.

Sound; comfortable

Needs a headphone amp; pads eventually flatten

Yup, I'll say it, one of the worlds greatest headphones.

Open headphones. Used since 2007 to mix, in addition to pregnant MSP5 Yam (recently traded for Solo6 Be

Exceptional sound clarity, very comfortable to ware. Professional quality, perfect for use on stage where you need to hear other components of production, or in studio these headphones are great.

I am going against the grain I guess. These cans are good, but they don't live up to the hype. The first time I demoed these they were going through a Creek headphone amp and after 20 minutes my ears were ringing. I told the salesman and he thought I was on glue.