Summary: The only real problem -- and it's relatively important for me -- is that the speaker part of this set that fits in the ear is a bit uncomfortable. I also noticed that the earbuds that came with mine don't look like the ones in the accompanying user manual. Can't figure out how to use them, either! So I'm wearing this using the ear clip, but the speaker part kind of sits "on" the opening to my ear, hence giving me that uncomfortable feeling.
Summary: I've been using this headset for about a week now. I'm not yet sure if I really like it. When I wear it with the ear clip, the ear piece feels uncomfortable against my ear. I've tried using the two in-ear buds and, unless I'm doing something wrong, they don't fit well and I don't feel that the unit is secure. As a matter of fact, I tried wearing it with an ear bud yesterday and the piece fell out of my ear as I was crossing a (busy) street!