Yes, I have....
I like the Audigy better than the Santa Cruz. BUT--if you are trying for 5.1 surround sound, get the Philips Acoustic Edge sound card.
The Audigy will do 5.1 surround sound on certain games (like Max Payne) which is really cool--all the cards will do it with a capable softDVD player. Overall, the best card out right now is the Audigy (note that no XP drivers are available right now--they'll be released on WinXP day).