I have to agree with the comments about the comfort. I do not find them very comfortable after a few hours of use, nothing unbearable, but not as comfortable as my 350's. This is possibly due to wearing glasses and the headphones are reasonably hard pressed against your ears.
Removing the velcro headstrap is a must as with that still attached, I could not really use them at all.
Now for the positives. The sound quality is superb, no complaints on this, very good for listening to music and gaming.
Overall I'm happy with them, once they become a bit worn in, I forsee the comfort issues improving.