So far on what I've heard the new xb600's are not worth the money but the new 800's have a comparable sound to the old 500's. Still begs the question, why not just buy the 500 for almost $100 less and get a more enjoyable sound?? If you want another option for a bass heavy can I would look to the M-Audio Q40's. They have bass that rivals the 500's but its a lot cleaner, less forced, and you wont look as goofy if you took them out in public. Sound wise it would be a joke to compare the two. I've owned them both and its no contest. The xb500's are super fun cans but once you get over the first impressions its like now what?? The Q40's are super basshead cans that have real quality sound throughout the entire field of sound not just in the bottom end. The only downfall is that they have the strongest clamping force I have ever experienced in a headphone so it will take some time to lossen them up to make it to where they are wearable for longer than half an hour. Plus the pads are not the most supporting pads in the world so those will need to be changed too. But all in all they are still vastly better than the XB line of headphones and for just over $100 they are def worth the look.
Enough said. I'll pass. Thanks ; )