I bought these from a shop as they were on deal for this same price.
I got the speakers out of the box and the first thing I though was of the wire mess but I was worrying too much and the they were were easy to setup and install. No drivers and plug into the green speaker slot.
The speakers are about the same size a Nintendo DS on it's side. These produce such amazing sound quality that I was utter surprised on how good they sounded.
The sub-woofer is of course bigger, I can't really thing of anything to compare it of but it stands taller than my Epson D92 print which it sits next to. Since I like a lot of Bass I crank it to full and I was again blown away with the quality of this things. The two 'Satellite' speakers are plugged into this woofer and the woofer then plugs into the computer as well as mains power.
Any other thing that comes with the kit, it what I can a little control panel that is about the size of a normal plug adapter this controls the volume and has a power switch. It also comes with a headphone jack from those night-times and don't want to wake up the parents, girlfriend, boyfriend, wife, husband or whatever.
To wrap up, these speakers were by far a major improvement than my old speakers. I've also tested them out on my Xbox 360 and my PSP and still got the same great sounds. I recommend these to anyway that would.