I own AD2 and it is great little tool at the price (which was around $280-300 at the time IIRC), but this slowly creeped up to price of say Rigol 1054Z with far less acquire capability.
I could see a lot of use out of it in setting a test jigs, as you can both generate and receive signal while having some digital IO to control DUT/the testing jig.
If I was doing audio stuff only and had to choose I'd probably pick this over a scope then just make a jig with a bunch of sockets common to audio stuff.
But for more generic stuff, eh, scope gonna give you soo much more.