Considering the quality of this app, I'm surprised that we don't have a discussion about it at Head-Fi.
For those who don't know, it's a music player that can take FLAC, WAV, OGG, and AIFF on the iPhone/iPad/iPod Touch. The nice touch is that it has a 10-band equalizer, and there are multiple effects that can be layered on top of the equalizer.
In my opinions, despite the not so polished interface (it's not bad, by the way), the sound quality of the app is top notch. It's by far my favorite music player on the iPhone. It has completely replaced the iPod app to me.
So is anyone else here using it?