OK! I just had to ask, right? :-)
I have a Delfina soundcard just like the one you're selling... it's really one of my all time best buys. I mean, wow, it is just incredible in my opinion.
I've primarily been using it for making music and editing audio, and there's nothing better than having an external digital sound processor when the Amiga's having trouble handling loads of audiochannels. Those flangers and phasers knows how to eat CPU, so external processing is really a must.
Musiclovers should have a card like this, that's for sure! ;-)