Currently with a T-Mo Vibrant (Galaxy S) Running CM7 Nightlies (going to do the new update-cm-7.2.0-RC1-vibrantmtd-signed.zip) today, and see how it goes. The latest Nightlies have been uber stable, and way better than stock. any day of the week.
I've only recently gotten Voodoo Sound Plus, and I'll have to say I'm wowed. I'd picked up that n7Player a couple weeks ago and liked it, then PlayerPlus or PowerPlayer or whatever that is called, but it conflicts with Google's Play Music, which is helped along by Voodoo Sound, and makes the EQ's in the apps irrelevant anyhow.
I'm considering myself happy.
If only the extra batteries that came with the charger I ordered had been the right kind, instead of for the Galaxy S II, I'd be REALLY happy. LOL. Now I have to deal with a little return issue, but I'd say this, just get some extra batteries and the Voodoo Sound app, use Airplaine Mode liberally, and enjoy. It really honestly sounds better than a Cowon. (I've had a D2, an O2PMP, an S9, they're all inferior to the Galaxy S with Voodoo Sound).