Anyone use EQ apps to listen to music on their phone/iPod?

I just downloaded the EQ10 app for $1 from the App Store, and all I can say is, wow... If you've never tried running your music through a parametric EQ (EQ10 also has a 10 band EQ) you need to try it. After adjusting it to my preference, the music sounds much more crisp, clear, and punchy. There's also a pre-gain slider that adjusts the bass without any distortion. You can really get the most out of your headphones and it blows the presets in the settings out of the water. No one else I know uses an EQ and I'm wondering if there are any other apps or methods to EQ your music.