My title, pros and cons sums it up rather well. Do NOT forget to warm these babies up for at least 30 h. They will change a lot in character, the first experience might be horrible, whilst after 40 h you love them.
 
It should be added that the treble sensitivity of your ears will affect your liking of these. Very demanding ears have listened to these and come to totally different conclusions. So listen to these at your local store before buying, your ears might not like the intense treble.