I can only comment on the Audigy, not the Audigy 2. My impression is that the card is OK. Then again, I only use it for games, and don't own anything other than a pair of headphones. I demand audio quality, not features, and a strict headphone user like me can be pretty hard to please in a world dominated by satellite speakers and subwoofers. ;-)
Cons:
The drivers need some work. For the longest time there was a volume bug that blared the speakers randomly on startup. It took them, like, two years to fix that. Also, the equalizer settings are WAY too primitive. Just a bass and treble, instead of a full spectrum equalizer. Very bad, considering I use headphones, and the default EQ setting is very tinny and optimized for external speakers. Right now, my Audigy performs like crap in my nForce2 board, with plenty of pops with high-end 3D games under Win2K. In WinXP, audio quality is untolerable, which forced me to use my nForce2 built-in audio until I downgraded back to Win2K. NASCAR Racing 2003, my favorite high-end game, has loads of 3D accelerated audio problems with the card. These problems are apparent in other games, but NASCAR Racing 2003 is a particularly good test. Also, the soldering around the jacks was very weak on my board, so I had to re-solder the connections to prevent crackling. My SB Live! card had many of the same issues, except the build quality was excellent.
Pros:
Powerful and clear line output. Impressivly low CPU utilization. The EQ is limited in functionality, but still mixes pretty well, nonetheless. The recording input is better than any other card I've owned. The impressive build of components delivers drasticly sharper sound quality than the DACs on built-in motherboard audio. The MIDI instruments are OK... Nothing special in terms of quality, but very universal and effective with loads of different music files. Overall, I think it's better than the nForce2 audio in terms of mix quality and options, and that says a lot. I'm upgrading my nVidia nForce2 board to an Intel 865PE in a few days. Hopefully my Audigy will perform better in that system.