For the price, these speakers are a bargain.
Features: Design is a 2.1 (2 desktop speakers + 1 bass/subwoofer). The addition of a input socket on the speaker to connect an MP3 headphone socket (3.5mm, no lead supplied) connection is a nice touch. Additionally, you get the 2 x RCA phone sockets on the subwoofer for external audio input. Volume level on subwoofer (on top of the overall volume level) helps control the likelihood of a 'boom, boom, boom' type situation, and the degree to how far the bass sound travels around the house!
Wiring is simple - mains to subwoofer, one lead from subwoofer to each desktop speaker. The subwoofer is downward firing (doesn't matter bass sound is omnidirectional), and its ported (has a hole at the front to improve the movement of the air / increase the bass - put your hand in front to feel the air moving). The 2 desktop speakers have similar ports on each speaker.
One word of caution, these ports will be nice places for 'little-ones' to use, so beware. Also, the speaker drivers themselves don't have any kind of grills/covers, so again little fingers could easily mess with the drivers and damage them - the drivers are mainly made of stiff paper; that's how most speakers work!
The desktop speakers have a rear firing speaker, in addition to the front speaker driver and the port at the front. Therefore, be careful with positioning - they need to be against a wall/flat surface to reflect the sound out to the front be heard at their best - but most people would position them in this way.
Soundwise: very good for the price, there is a definite 'sweet spot' for the best treble to be heard, but due to the design, this would be in a good position for normal use in front of speakers viewing/gaming. They aren't house shaking, but enough to shake a single room at a time - may struggle with enough power for a house party, but they'll go a long way to fill one room with sounds.
Appearance wise: desktop speakers are 'piano black' which goes nicely with most monitors/TV's. Hide the subwoofer wherever under the desk. Also excellent use for second speakers for bedroom DVD / TV / x-box / playstation etc, or even to take in the car for a hotel room/weekend away (as long as you have access to mains power of course!). Forget your small laptop speakers, these will add a degree of treble and bass that you can't get from built in speakers. Good product.