I've been using acoustic edge for a little more that a year. It is very stable and packed with a lot of features (S/PDIF, EAX 2.0, QMSS, .....) and it uses less cpu cycles than SB live.
The sound quality is very good for its price range but don't expect "audigy class" sound quality.
If I remember it correctly, I used this soundcard listening to mp3 with winamp using MAD plugin in 24 bit resolution, and u can't do that with SB live.
I'll try to contact my friend who works for Philips in the soundcard QA dept., coz i think he is the most qualified person to give comment for this topic.