They are a little smaller, same driver size. I really like them. Stock signature with bassy music is almost too much bass, but here is the caveat, once you EQ 90hz down man does the sound really come together. Same great feel and build quality and I love the styling. I am sadly selling them as I'm about to go into a two year Master of Social Work program so I need money for books and I am just keeping my Pioneer SE Monitor 5, but frankly, I'll have very little time for music. PM me if you are interested in the H900M, mine is mint, absolutely pristine, low hours. I wasn't going to sell through head-fi as I find selling here in Canada much easier, but I've sold and shipped to the US plenty. NY is close to Ontario. Just in case you're interested. Cheers.