USB speakers for powerbook - advice?

[aswitcher]

These were recommended to me but I can't find out much about them and I don't know much about music and speakers. If they work as claimed they could be what I am after

http://www.macally.com.au/product_in...products_id=78

USB Mobile Theater 200W

6 Channel Performance in 2 Speaker
Compliant with any notebook, PC with USB v1.1 & 2.0
Provide 5.1 virtual effect, Adjustable EQ (equalizer) and 3D surround performance
High digital audio fidelity and completely "hiss-free"
Plug and play. No adapter required
Installation driver enclosed
Features

6 Channel Performance in 2 Speaker, simple way to enjoy multi-channel sound
Adopted latest Xear 3D TM technology, support EAX, A3D acoustics
effect.
5.1 Virtual SPEAKER SHIFTER function to provide dynamically adjustable
multi-channel sound system.
Offer 27 Environment effects, 3 environment sized and 10-band pre-set equalizer.
Pure digital audio and lowest acoustic distortion
USB Bus-Power, Plug and play