great quality usb and analogue headset,
This review is from: Sennheiser PC 166 USB Headset (Electronics)
Had this headset for a number of months now and the quality is excellent as you would expect from Sennheiser.
I bought this for Skype as I was advised to get a USB headset which comes with its own sound card in the USB adaptor.
This means the sound is high quality even if you have a poor sound card on a budget laptop for example. Also some computers
have no sound card or only an unpowered linein such as with the Mac Mini so you would need a powered mic and the usb solves that issue.
You can unplug the usb adaptor if you prefer to use the headset's mini phono jacks or your computer has no usb available. This offers flexibility
but means it is possible to lose the adaptor which is just a usb plug with two wires/minijacks attached which can be annoying 5 minutes
before an important Skype call.