Basic headset but way better than any bluetooth
I have tried all the bluetooth headsets out there and none of them all sound clear. The only one that I would consider using is the Jawbone. I got this in an Office Depot and haven't used any other headset since. Most people think I am on a landline because there is no echo and no static. Unfortunately, you just can't beat a corded headset.

Works well, but does not wear well
I was looking for something cheap, and I found it. Sound quality is good, and people seem to understand me well despite noisy outdoor environments. However, I'm not a big fan of the fit. They have 2 rubbery pieces that you slip over the ear piece to fit in your ear. One is for the right ear, the other for left. I'd prefer a uni-ear design. Didn't really think about it, but having a button to answer and end calls is very handy. This head set does not have this.

All in all, this was a $20 mistake, but I'm continuing to use since the sound quality (on both ends) is ok.

Junk! Static & low volume
I think it might be defective. I returned it. Can't be heard on the other end due tolow volume and horrible static. I have Panasonic headsets that work great. Plantronics is useless. I've returned all of their headsets. Junk!

Good one for the price
I bought this headset about a year ago when I decided the one I had was just too uncomfortable on my ear. So I stopped in @ Staples and picked this one up. I like it for several reasons, it fits in your ear and comes with a left or right ear adapter, it clips over your ear yet is very comfortable. I have no problem hearing or being heard. I am in my car all day long calling and receiving calls all day and this worked for me. The main thing I hated about my other four headsets was uncomfortable fit, wobbling or hard to hear. I did not have any of these problems with this headset. I would reccommend it.

Barely works, nasty feedback
Going by the Plantronics name I bought a pair of M60 headsets to use on a cell and a miniphone. They are incredibly cheaply made, and when my wife gave them a try she got a NASTY feedback squeal several times during a long call. Essentially unusable, unless we find some trick that we have missed so far. We ordered a Sennheiser PC120 to try instead.