I just got these today and so far I think they are great. Picked them up at Directron for $77.99 ($84.42 with tax).
I don't to some people this might not matter but to others it might. The headphone jacks works like one would expect. You plug in the headphones and speakers are muted and the volume control on the remote controls the headphone volume.
I read a review once for the X-530 and that reviewer tried out the headphone port and found that it basically nothing more than extension from the front speaker port on the sound card. The speakers weren't muted, if I remember that correctly, and the volume control for the speakers did not effect the headphone jack.