A few days ago I got a pair of Sennheiser Momentums which I got on a great deal, open box from Amazon. They arrived in perfect condition, though they had been opened previously (I don't care).

However, I'm returning them. Even after adjusting, they hurt my ears after less than an hour.

I've ordered a pair of Sennheiser 598s instead, those are reviewed to be extremely comfortable. We shall see.