Yeah... THX Certification is worth about as much as the old Dolby Certification, or whatever. It's a fancy term that looks good, yet does not really help the ears.
Personally, from what I've seen and read, the Audigy 2 should be a pretty good soundcard, especially for the $80 you picked it up for. Don't expect miracles, but it should be a better card than the Live! series, which, all in all, weren't terrible (other than the drivers...)
My overall assessment would be that it's a good card for a gaming rig, probably overkill for a general use computer, and probably not high-end enough for a music/sound workstation. Of course, my assessments are worth every penny I charge for them. ($0)
