From DigiTech's website: "Unlike devices that require you to stay tethered to your iOS device, the iStomp does all of its processing internally. This means professional-quality, high-definition signal processing with no latency and you don’t need your iOS device while you’re playing."
With the companion Stomp Shop app loaded on your iPhone, you can explorer and audition dozens of various effects. Select from compressors, overdrives, chorus, delay, and reverb just to mention a few. Once loaded into your iStomp, the iPhone no longer needs to be connected.
Good quality effects. Sometimes i use it as a RAT clone – sometimes as Lexicon reverb. It's in my peadlboard and it's everything i need, in the moment need it.