Lets start off with the centre channel. The only difference between this speaker and the left/right speakers is the crossover point (according to the spec). It's supposed to reduce low end extension and therefore give a more accurate output. My opinion? Sound's pretty sweet to me :)
These go pretty hard. I seem to be listening to more 2ch material since I've got them. And these things can handle the low end quite well so sending the bass info to these rather than the sub gives a nice full bodied sound (but I won't 'cause I'd rather not blow the bass drivers thanks)
Finally the subwoofer. I got this when we had the Pro-Logic receiver and it went pretty well then, but now (if it's possible) it sounds more defined. I haven't really pushed this to the limit (well maybe once or twice), but it sure does put out :)