For stereo audio input, mic input, and guitar input, there's nothing better. Sound quality is excellent, and the unit is physically solid—almost too solid!
In my quest to find the killer solution for audio recording/input on my iOS devices, I've tested a ton of different external microphones and audio interfaces for the iPhone 4/4S, iPad, and iPod Touch. One class of device—a multi-channel input through the iPhone 4's dock connector—has been elusive until just recently, when three different devices were introduced a year after the iPhone 4:
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