This is an Audio Test and Unboxing Hands-on review of Sennheiser PC 8 USB Headset with Mic.
Headset sound is very good but not comparable to over the ear headphones by Sennheiser. But sound quality is better than Sennheiser PC 3 headset which has two 3.5 mm jacks.
Microphone on the headset is great. Noise cancelling works very well but not the best.

Sennheiser PC 8 USB Headset with Mic Box Front
Sennheiser PC 8 USB Headset with Mic Box Front
Sennheiser PC 8 USB Headset with Mic Back
Sennheiser PC 8 USB Headset with Mic Back