Well Creative aren't exactly known for the quality of their sound cards, but because they're cheap and ubiquitous.
I, for one, have no intention of getting a SB for my future A1, but intend to use the onboard audio untill proper sound cards are supported (24bit ones) and don't mention the Audigy, after the stunt they pulled with the first version, i simply don't trust them (selling a 16bit sound card as a 24bit one is grounds for execution, IMO :-x ).