Well for all the 3,4,5 piece speakers, the subwoofer will always never be as good as HiFi speakers because they are all vented. This means that there is air resistnce against the cone which will hinder the tightness of the bass. It won't matter when playing games, but when you want to listen to music, or MP3s, the bassline will be slow, and sometimes distorted. For games it will be OK. The reason for the vent is also not just for the looks, but for cooling as I have founf out taking apart a Cambridge Works 4.1 The air which flows inside it will cool the circuits. But if you want a good 2.1 setup then go for the Creative Labs ones.
Hope this helped,
Albert.