Summary: i got these because they look like the ones plantronics used to make. While they are similar, the are not nearly as comfortable. These have foam ear pads instead of the leatherette ones. And the gap between the speaker and the top of the band is too narrow so it kinda pinches the top of my ear. They are fine for an hour or so then they start to hurt. Sound quality is fine on speakers and mic.
Summary: Mixed usefulness - the reason being that this is a good product and easy to carry around and has good sound quality when it works / connects well. The problem is that I bought this for my Tablet and the jack has to be perfectly and very sensitively adjusted to get good sound. So while speaking, I cannot move around as the jack will dislodge. However, the product is otherwise of good quality.
Summary: I am using it every day and I am happy for selecting this. Sound and microphone quality is good. It comes with a long wire so that you can comfortably wear and roam around. ;) It can be folded and put in a pouch which comes along with it. So, it is easy to carry. This is a good option if you are a general user for music, online chat, etc but if you are looking for any very high quality audio headphones, you must rethink.
Summary: So these things are kind of cheaply made. They seem sturdy at first, but after about a week of use the action on the microphone starts to wear and the headset stops gripping your head like a vice. The latter is not a bad thing, and they're still wearable and useable, but the difference is a bit worrying when you first notice. Now that being said, sound quality on these are not bad.
Summary: The wiring for the speakers/drivers/etc. in the earphones became unstable within a month of use. Microphone still works, but overall a bad product because of lack of durability and/or lifetime of item.