I have the PC151 w/ the usb soundcard. The sound quality is very good on both the headphone and the mic. You should note that it's description is misleading. Neither is circum-aural. The PC161's earpieces are a bit larger, but they are both supra-aural, and rest directly on your ears. Also, the headset is a bit heavy and wants to slide off my head if I look down, it's not a big complaint, but it does get annoying. They're comfortable, but not as much as a circum-aural headset.