Pros:small size, USB power required only, they have a headset outlet on the front, CHEAP!
Cons:Sound has little or no bass (limited frequency range).
Look you get what you pay for, so you can't expect a lot from these. Having said that, if you are looking for inexpensive speakers so that you can work around your room with some music, and to play games where you are not interested in a "full immersion experience," then this is for you. Also, you do not need an outlet or in my case, a power converter because I move from country to country. I plug these into my USB port and I have sound. You can get these for under $15 with shipping included, so can't beat it!
Having them plugged into your USB port means that you draw power from your computer. You turn off the computer and they turn off too. That is a plus, since all other speakers that are not USB remain ON, drawing power unless you switch them off. In short, these will pay for themselves in no time.
Again, if you are looking for a good Bass...go to bose.com. These are meant to be inexpensive and deliver value, not quality.